UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                   Under the Securities Exchange Act of 1934
                              (Amendment No. 28)*

                               XO HOLDINGS, INC.
                                (Name of Issuer)

                    Common Stock, par value $0.01 per share
                         (Title of Class of Securities)

                                   98417K106
                                 (CUSIP Number)

                               Marc Weitzen, Esq.
                                General Counsel
                             Icahn Associates Corp.
                          767 Fifth Avenue, 47th Floor
                            New York, New York 10153
                                 (212) 702-4388
          (Name, Address and Telephone Number of Person Authorized to
                      Receive Notices and Communications)

                                October 8, 2010
            (Date of Event which Requires Filing of this Statement)

If  the filing person has previously filed a statement on Schedule 13G to report
the  acquisition  that  is  the subject of this Schedule 13D, and is filing this
schedule because of ss.ss. 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the
following  box  /  /.

NOTE:  Schedules  filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Rule 13d-7 for other parties
to  whom  copies  are  to  be  sent.

*The  remainder  of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent  amendment  containing  information  which  would  alter
disclosures  provided  in  a  prior  cover  page.

The information required on the remainder of this cover page shall not be deemed
to  be  "filed"  for the purpose of Section 18 of the Securities Exchange Act of
1934  ("Act") or otherwise subject to the liabilities of that section of the Act
but  shall  be  subject  to  all  other  provisions of the Act (however, see the
Notes).



Item 1. Security and Issuer

     This statement constitutes Amendment No. 28 to the Schedule 13D relating to
the  shares  of  Common  Stock,  par value $0.01 per share (the "Shares"), of XO
Holdings,  Inc.,  a Delaware corporation (the "Issuer"), and amends the Schedule
13D  relating  to  the  Shares  filed on January 27, 2003 and amended by each of
Amendments  Nos.  1  through  27 (as amended by Amendment Nos. 1 through 27, the
"Original  13D"),  on  behalf  of the Filing Persons (as defined in the Original
13D).  Capitalized  terms  used  herein  and  not  otherwise  defined  have  the
respective  meanings  ascribed  thereto  in  the  Original  13D.

Item 6. Contracts, Arrangements, Understandings or Relationships with Respect to
        Securities of the Issuer

     Item 6 of the Original 13D is hereby amended by adding the following:

     On  October  8,  2010,  Arnos  Corp.,  an  entity affiliated with Mr. Icahn
("Arnos"),  entered  into  a  Revolving  Promissory  Note  (the "Note ") with XO
Communications,  LLC  ("XOC"),  pursuant  to which Arnos made available to XOC a
revolving  loan  facility  of  up  to $50,000,000 in aggregate principal amount.
Borrowings  under  the  Note will bear interest at the greater of the LIBOR rate
plus  525  basis  points  and  6.75%.  The  Note also includes a fee of 0.75% on
undrawn  amounts.  The Note matures on the earliest of (i) October 8, 2011, (ii)
the  date  on  which  any  financing  transaction,  whether  debt  or equity, is
consummated by XOC or certain of its affiliates in an amount equal to or greater
than  $50  million,  and  (iii)  at XOC's option, a date selected by XOC that is
earlier  than October 8, 2011. The obligations of XOC under the Note are jointly
and  severally guaranteed by the Issuer and certain subsidiaries of XOC pursuant
to a Guaranty Agreement, dated as of October 8, 2010 (the "Guaranty Agreement").
Copies of the Note and the Guaranty Agreement are filed as Exhibit 1 and Exhibit
2  hereto,  respectively,  and  are  incorporated  herein  by  reference.  Any
descriptions herein of the Note or the Guaranty Agreement are qualified in their
entirety  by  reference  to  the Note and the Guaranty Agreement filed herewith,
respectively.

Item 7. Material to be Filed as Exhibits

     Item 7 of the Original 13D is hereby amended by adding the following:

     Exhibit 1     The Note
     Exhibit 2     The Guaranty Agreement



                                   SIGNATURE

     After  reasonable  inquiry  and  to  the  best  of  each of the undersigned
knowledge and belief, each of the undersigned certifies that the information set
forth  in  this  statement  is  true,  complete  and  correct.

Dated: October 8, 2010


ACF  INDUSTRIES  HOLDING  CORP.

     By:  /s/  Keith  Cozza
          -----------------
          Name:  Keith  Cozza
          Title:  Vice  President


HIGHCREST  INVESTORS  CORP.

     By:  /s/  Keith  Cozza
          -----------------
          Name:  Keith  Cozza
          Title:  Vice  President


BUFFALO  INVESTORS  CORP.

     By:  /s/  Edward  E.  Mattner
          ------------------------
          Name:  Edward  E.  Mattner
          Title:  President


STARFIRE  HOLDING  CORPORATION

     By:  /s/  Keith  Cozza
          -----------------
          Name:  Keith  Cozza
          Title:  Treasurer


ARNOS  CORP.

     By:  /s/  Keith  Cozza
          -----------------
          Name:  Keith  Cozza
          Title:  Authorized  Signatory






ARNOS  SUB  CORP.

     By:  /s/  Keith  Cozza
          -----------------
          Name:  Keith  Cozza
          Title:  President


BARBERRY  CORP.

     By:  /s/  Keith  Cozza
          -----------------
          Name:  Keith  Cozza
          Title:  Treasurer


HOPPER  INVESTMENTS  LLC
By:  Barberry  Corp.,  its  sole  member

     By:  /s/  Keith  Cozza
          -----------------
          Name:  Keith  Cozza
          Title:  Treasurer


HIGH  RIVER  LIMITED  PARTNERSHIP
BY:  Hopper  Investments  LLC,  its  general  partner
BY:  Barberry  Corp.,  its  sole  member

     By:  /s/  Keith  Cozza
          -----------------
          Name:  Keith  Cozza
          Title:  Treasurer


UNICORN  ASSOCIATES  CORPORATION

     By:  /s/  Keith  Cozza
          -----------------
          Name:  Keith  Cozza
          Title:  Vice  President








/s/  Carl  C.  Icahn
- --------------------
CARL  C.  ICAHN



Exhibit  1

                                                               EXECUTION VERSION

                           REVOLVING PROMISSORY NOTE
                           -------------------------

                                                              New York, New York
US$50,000,00.00                                            as of October 8, 2010

     FOR  VALUE  RECEIVED,  XO Communications, LLC (together with its successors
and  assigns,  the "Borrower"), HEREBY UNCONDITIONALLY PROMISES TO PAY to, or to
the  order  of,  Arnos  Corp.  (together  with  its  successors and assigns, the
"Lender"),  on  the  terms  hereinafter  set  forth,  the principal sum of FIFTY
MILLION  DOLLARS  ($50,000,000.00), or such lesser amount as is outstanding from
time  to  time as set forth on Schedule 1 hereto, together with interest thereon
for  such  periods, on such dates and at such rates as set forth in Section 1 of
this  Note.

The Borrower further promises to pay the Undrawn Amount Fee (as hereinafter
defined), and any other amounts owed hereunder as such Undrawn Amount Fee and
other amounts shall become due and payable pursuant to the terms hereof.

     1.  Interest.  The principal amount of each borrowing under this Promissory
Note  (this  "Note")  outstanding  from  time to time as set forth on Schedule 1
hereto  shall bear interest at a rate equal to the greater of (x) the LIBOR Rate
plus  525 basis points, per annum and (y) 6.75%, per annum, which interest shall
accrue  daily  and be compounded quarterly and shall be computed on the basis of
the  actual  number  of  days  elapsed  over a 360-day year. Such interest shall
commence to accrue on the date of each applicable borrowing and shall be due and
paid  in  arrears on or, at the Borrower's option, before, each of April 8, 2011
(to  the  extent  outstanding  on  such  date) and the Maturity Date (as defined
below)  or  such  earlier  date  as  principal, interest, the Undrawn Amount Fee
and/or  other  amounts shall become due and payable pursuant to the terms hereof
(provided  that  if any such day is not a Business Day (as hereinafter defined),
such  payment  shall  be  made on the immediately following Business Day with no
additional  interest accruing thereon, if so made). To the extent any payment of
interest  is  made  prior to 12:00 noon (New York City time) on the date of such
payment,  no interest shall accrue on such date with respect to such payment. To
the extent any payment of interest is made after 12:00 noon (New York City time)
on  the  date of such payment, interest shall accrue and be payable on such date
with  respect  to  such  payment.

     Notwithstanding  the  foregoing,  during  any  period  in which an Event of
Default  exists,  the  principal amount of each borrowing outstanding under this
Note  shall  bear  interest at a rate equal to the greater of (x) the LIBOR Rate
plus  725  basis  points,  per  annum  and  (y) 8.75%, per annum (such rate, the
"Default  Rate"),  which  interest  shall  be  compounded quarterly and shall be
computed  on the basis of the actual number of days elapsed over a 360-day year.
Any  amounts  payable  hereunder  that are not paid when due (whether principal,
interest,  Undrawn  Amount  Fees  or other amounts) shall, to the fullest extent
permitted  by  applicable  law,  bear  interest  at  the  Default Rate. Anything
contained  in  this  Note  or  any  other  related  document  to  the  contrary
notwithstanding,  the  Lender  does not intend to charge, and the Borrower shall
not  be  required to pay, whether under this Note or any other related document,
any  amount  to  the  extent  in  excess  of  the maximum amount permitted under
applicable  law, and the Lender shall, at Lender's discretion, either return any
such  excess  amount  or  same  shall be credited against the principal or other
amounts  due  hereunder.

     As  used  in  this Note, the term "Business Day" means any day other than a
Saturday,  Sunday  or  other day on which commercial banks in New York City, New
York  are  authorized  or  required  by  law  to  close.

     As  used  in  this  Note,  the term "LIBOR Rate" means, with respect to any
borrowing  under  this  Note, the rate appearing on Bloomberg's British Banker's
Association  rate page (or on any successor or substitute page) at approximately
11:00  a.m., London time, one Business Day prior to the disbursement of funds in
respect  of  such  borrowing,  as the rate for U.S. dollar deposits for a period
equal  to  six  (6) months. In the event that such rate is not available on such
page  at  such  time  for any reason, then the "LIBOR Rate" with respect to such
borrowing under this Note shall be determined by reference to any analogous page
of  another quotation service providing quotations comparable to those currently
provided  on  such page for interest rates applicable to U.S. dollar deposits in
the  London  interbank  market,  as  reasonably  determined  by  the  Lender.

     2.  Undrawn  Amount  Fee.  The  Borrower  shall pay to the Lender a Undrawn
Amount Fee (the "Undrawn Amount Fee") for the period from and including the date
hereof  to  but  excluding  the  Maturity Date equal to 0.75%, per annum, of the
average  daily  unused  amount  of  the Commitment (as defined below), which fee
shall  accrue  daily  and  be computed on the basis of the actual number of days
elapsed  over  a  360-day  year and shall be paid in arrears on each of April 8,
2011 (including interest accrued on such date) and the Maturity Date. As used in
this  Note,  the term "Commitment" means, as of any date, the Maximum Amount (as
defined below) less the aggregate principal amount outstanding hereunder on such
date.

     3.  Maturity  Date.  The  outstanding  principal  amount  under  this Note,
together  with  all then accrued but unpaid interest thereon, any unpaid Undrawn
Amount  Fees  and any other amounts then due and payable hereunder, shall be due
and  paid  by  Borrower on the earliest of (i) October 8, 2011, (ii) the date on
which  any  financing transaction, whether for debt or equity, is consummated by
Borrower  and/or  any  Guarantor  (as  defined  below)  in an amount equal to or
greater  than $50,000,000 and (iii) a date selected by Borrower that is prior to
October  8,  2011, provided such date is contained in a written notice delivered
to Lender at least two Business Days prior to such earlier date (the earliest of
such dates, the "Maturity Date"). No further borrowings shall be permitted after
the  Maturity  Date.

     4.  Requests  for  Borrowing.  From  time to time following the date hereof
through  the  Maturity  Date,  the Borrower may make a written request to borrow
from  the Lender principal amounts under this Note up to a maximum amount not to
exceed, together with the aggregate principal amount then outstanding under this
Note,  FIFTY  MILLION  DOLLARS  ($50,000,000.00), in the aggregate (the "Maximum
Amount").  Such  borrowings  shall be in increments of $1,000,000 each, or whole
multiples  of  $1,000,000  in  excess  thereof, (or if the then aggregate amount
available  for borrowing under this Note is less than $1,000,000, such aggregate
lesser  amount).  Within two (2) Business Days following Lender's receipt of any
such  borrowing  request,  the  Lender  shall  arrange to lend and disburse such
monies  to  the  Borrower so long as, and to the extent, the aggregate principal
amount  outstanding under this Note, after giving effect to such borrowing, does
not  exceed  the  Maximum  Amount.

     Simultaneously  with  any  borrowing  hereunder,  the  Lender  shall update
Schedule  1  hereto  accurately to reflect any amounts to be so borrowed and the
aggregate  principal  amount  outstanding  under  this  Note after giving effect
thereto  and, upon approval thereof by the Borrower, the Lender and the Borrower
shall  each affix the initials of their respective authorized representatives to
such updated Schedule 1, which shall thereafter constitute prima faciae evidence
of  the  aggregate  principal  amount  due  hereunder.

     Disbursement  of  any  monies  by the Lender in connection with a borrowing
hereunder  shall  be  made  to  the  Borrower  by  wire  transfer of immediately
available  funds in accordance with the instructions that the Borrower specifies
to  the  Lender  in  the  applicable  written  request.

     5. Payments. The Borrower may prepay all or any portion of this Note at any
time  without premium or penalty; provided that any partial prepayment hereunder
shall  be  in increments of $1,000,000 each, or whole multiples of $1,000,000 in
excess  thereof  (or if the then aggregate amount outstanding under this Note is
less  than  $1,000,000, such lesser aggregate amount). All payments made on this
Note shall be made to the Lender by wire transfer of immediately available funds
in  accordance with the instructions that the Lender may specify to the Borrower
in  writing  from  time  to  time.  All payments to the Lender received from the
Borrower  hereunder  shall be applied first, to the payment of any Expenses owed
to  the Lender that are then due and payable pursuant to the terms of this Note,
second,  to the payment of any accrued Undrawn Amount Fees that are then due and
payable  pursuant  to  the  terms of this Note, third, to the payment of accrued
interest  that  is  then due and payable pursuant to the terms of this Note, and
fourth,  to  reduce  the  principal balance hereunder. Any payments of Expenses,
Undrawn  Amount Fees, principal or interest shall be made in U.S. dollars and in
immediately  available  funds  and  without  deduction  or reduction of any kind
(whether  for  set-off,  recoupment  or  otherwise).

     Simultaneously  with  any  prepayment  hereunder,  the  Lender shall update
Schedule  1  hereto  accurately  to reflect any amounts to be so prepaid and the
aggregate  principal  amount  outstanding  under  this  Note after giving effect
thereto  and, upon approval thereof by the Borrower, the Lender and the Borrower
shall  each affix the initials of their respective authorized representatives to
such updated Schedule 1, which shall thereafter constitute prima faciae evidence
of  the  aggregate  principal  amount  due  hereunder.

     6.  Representations  and  Warranties.  The  Borrower  hereby represents and
warrants  to  the  Lender  that (a) this Note when executed and delivered by the
Borrower  shall  constitute  a  valid  and  binding  obligation of the Borrower,
enforceable  in  accordance  with  its  terms,  subject  only to laws of general
application  relating  to  bankruptcy, insolvency and the relief of debtors; (b)
the  Borrower  is  not  in  violation  or  default  of  any mortgage, indenture,
agreement,  instrument  or  contract  to  which  it is a party or by which it is
bound,  except  where such violation or default would not reasonably be expected
to  have a material adverse effect on (x) the ability of the Borrower to perform
its  obligations  hereunder  or (y) the validity or enforceability of this Note;
and (c) the execution, delivery and performance by the Borrower of this Note and
the consummation of the transactions contemplated hereby, will not result in any
such  violation  or  default  or  an  event  that results in the creation of any
material  lien,  charge  or  encumbrance  upon  any  assets  of  the  Borrower.

     7.  Event  of  Default.  This Note shall become immediately due and payable
upon  the  occurrence  of an Event of Default, whereupon the unpaid principal of
this  Note  and all accrued and unpaid interest, accrued Undrawn Amount Fees and
any  other  amounts  owed  hereunder  shall  become  and  be immediately due and
payable, without presentment, demand, protest or further notice of any kind, all
of which are hereby expressly waived by the Borrower. For purposes of this Note,
the  occurrence  of  any of the following shall constitute an "Event of Default"
under  this  Note:

          (a)  any  failure by the Borrower to pay to the Lender on the Maturity
     Date  an amount equal to the then outstanding aggregate principal amount of
     this  Note  together  with all accrued but unpaid interest thereon (and any
     other  amounts  owed  hereunder);

          (b)  any failure by the Borrower to pay to the Lender on or before the
     applicable  due  date  thereof  (as  provided  by  this Note), any interest
     payment,  Undrawn Amount Fees, payment of Expenses and any other payment as
     and  when  due hereunder, which failure remains uncured for a period of ten
     (10)  days  following  the  applicable  due  date  thereof;  or

          (c)  any  material  breach  by  the  Borrower  of  any  other terms or
     provisions  of  this Note, which breach remains uncured for a period of ten
     (10)  days following (x) the date on which the Lender apprises the Borrower
     in  writing  of  the  existence of such breach or (y) the date on which the
     Borrower  otherwise  becomes  aware  of  the  existence  of  such  breach.

     8.  Assignment;  Transfers;  Successors.  This Note may not be transferred,
assigned,  pledged  or  encumbered, in whole or in part, by the Borrower and the
Borrower may not assign any rights or delegate any of its obligations under this
Note,  in  each  case without the prior written consent of the Lender. This Note
may,  with  reasonable  prior  written  notice  to the Borrower, be transferred,
assigned,  pledged or encumbered, in whole or in part, by the Lender without the
prior written consent of the Borrower. Subject to the foregoing, this Note shall
inure to the benefit of and be binding upon the successors and permitted assigns
of  the  Borrower and the Lender. There are no third party beneficiaries of this
Note.

     9.  Amendment;  Waiver.  Any  amendment  hereto  or waiver of any provision
hereof may be made only with the written consent of each of the Borrower and the
Lender.  No failure or delay by the Lender to insist upon the strict performance
of  any  term  or  condition  of  this  Note, or to exercise any right or remedy
consequent  upon a breach thereof, shall constitute, or be deemed to constitute,
a  waiver  of  any such term or condition or of any such breach, or preclude the
Lender  from  exercising any such right or remedy at any later time or times. By
accepting  payment  after  the due date of any amount payable under the terms of
this  Note,  the  Lender  shall not be deemed to have waived the right either to
require  prompt payment when due of all other amounts payable under the terms of
this  Note  or  to  declare  an  Event of Default for the failure to effect such
prompt  payment  of any such other amount. No course of dealing or conduct shall
be  effective  to  modify,  waive  or  release  any  provision  of  this  Note.

     10. Costs and Expenses; Indemnity. The Borrower hereby agrees to pay all of
the Lender's costs of collection or attempting to collect the same and any other
enforcement  of  this  Note, including without limitation, reasonable attorneys'
fees  and  disbursements and court costs (including those incurred in connection
with  any  appeal) (the foregoing costs and expenses being referred to herein as
"Expenses"). The Borrower shall protect, defend, indemnify and save harmless the
Lender  and  any  of  its  affiliates  and their respective officers, directors,
members,  partners,  stockholders,  controlling  persons  and employees (each an
"Indemnitee"),  from  and against all liabilities, obligations, claims, damages,
penalties,  causes  of  action, costs and expenses (including without limitation
reasonable  attorneys'  fees  and  expenses),  imposed  upon  or  incurred by or
asserted against any Indemnitee by reason of or in connection with the extension
of  credit  by the Lender pursuant to this Note or any of the terms thereof. The
obligations  and  liabilities of the Borrower under the foregoing sentence shall
survive  any  termination,  satisfaction,  or  assignment  of  this  Note or the
indebtedness  covered  hereunder.

     11.  Guaranty.  Any  and  all  amounts  owing  pursuant  to  this  Note are
guaranteed  in  accordance  with the terms of that certain Guaranty, dated as of
the  date  hereof,  executed by the following affiliates of the Borrower for the
benefit of the Lender: XO Holdings, Inc., Telecommunications of Nevada, LLC, V&K
Holdings,  Inc., XO International Holdings, Inc., XO International, Inc., and XO
Nevada  Merger  Sub,  Inc.  (collectively,  the  "Guarantors").

     12.  Certain  Waivers.  The  Borrower  hereby  waives  presentment, demand,
protest,  notice  of  acceptance,  notice of dishonor, notice of protest and all
other  notices  of any kind. Should any indebtedness represented by this Note be
collected at law or in equity or in bankruptcy or other proceedings after demand
therefore has been made, or should this Note be placed in the hands of attorneys
for  collection  after  default.

     13.  WAIVER  OF  JURY  TRIAL.  EACH  OF THE BORROWER AND THE LENDER, BY ITS
ACCEPTANCE  OF THIS NOTE, HEREBY IRREVOCABLY AND UNCONDITIONALLY WAIVES TRIAL BY
JURY  IN  ANY  LEGAL  ACTION  OR  PROCEEDING  RELATING TO THIS NOTE OR ANY CLAIM
RELATING  THERETO.

     14.  Notices.  All notices hereunder shall be given in writing and shall be
deemed  delivered when received by the party to whom such notice is addressed at
the  address  set forth below such party's signature or at such other address as
may  be  specified  by  such  party  from  time  to  time.

     15.  Governing  Law; Jurisdiction. This Note and the legality, validity and
performance  of  the  terms  hereof  is  made  in  accordance  with and shall be
construed  under  the  laws  of  the  State  of  New York, without regard to the
conflicts  of law principles thereof that would result in the application of any
law  other  than  the  law  of the State of New York. Each of the Lender and the
Borrower  hereby  (a)  submits  to  the  exclusive  jurisdiction of any state or
federal  court sitting in New York, New York in any action or proceeding arising
out  of  or relating to this Note, (b) irrevocably waives, to the fullest extent
it  may  effectively  do  so,  the  defense  of  an  inconvenient  forum  to the
maintenance  of  such action or proceeding, and (c) agrees that venue therein is
proper  and  convenient.



     16.  Counterparts. This Note may be executed in counterparts, each of which
shall  be  considered  an original but all of which together shall be deemed one
instrument.

                                  BORROWER:
                                  XO COMMUNICATIONS, LLC

                                  /s/ Laura W. Thomas
                                  -------------------
                                  Name:  Laura W. Thomas
                                  Title:  Senior Vice President, Chief Financial
                                          Officer and Manager
                                  Address:  13865 Sunrise Valley Drive
                                            Herndon, Virginia 20171
                                  Facsimile: 703-547-2025
                                  Attention:  General Counsel


ACCEPTED AND AGREED
AS OF THE DATE FIRST
WRITTEN ABOVE:

LENDER:
ARNOS CORP.

/s/ Edward E. Mattner
- ---------------------
Name: Edward E. Mattner
Title: Authorized Signatory
Address:  c/o Icahn Associates Corp.
          767 Fifth Avenue, 46th Floor
          New York, New York  10153
Facsimile: 650-328-6345
Attention:  Chief Financial Officer


[PROMISSORY  NOTE,  DATED  OCTOBER  8,  2010,  EVIDENCING  REVOLVING  LOAN  OF
$50,000,000.00  FROM ARNOS CORP. TO XO COMMUNICATIONS, LLC, DUE OCTOBER 8, 2011]




                                   Schedule 1
                                   ----------



DATE OF        AMOUNT OF      AGGREGATE AMOUNT       LENDER'S         BORROWER'S
BORROWING/     BORROWING/     OUTSTANDING AFTER      INITIALS         INITIALS
PREPAYMENT     PREPAYMENT     BORROWING/PAYMENT      --------         ----------
- ----------     ----------     -----------------





EXHIBIT 2
                                                               EXECUTION VERSION
                                                               -----------------

                                    GUARANTY

     For  good  and valuable consideration, the receipt and sufficiency of which
are  acknowledged,  the  undersigned  (the  "Guarantors") jointly, severally and
unconditionally  guarantee,  in accordance with the terms hereof and without any
prior  written  notice,  the full and punctual payment and performance of all of
the  Liabilities (as defined herein) when due (the "Guaranty"), whether required
by  acceleration  or  otherwise  of  XO  COMMUNICATIONS, LLC, a Delaware limited
liability company (the "Company"), to the Lender (as defined herein) pursuant to
that  certain  US$50,000,000  Revolving Promissory Note issued by the Company in
favor  of  the  Lender  as  of October 8, 2010 (the "Note"). This Guaranty is an
absolute, unconditional and continuing guaranty of the full and punctual payment
as  well  as  performance  of  all of the Liabilities whether now outstanding or
arising  in the future. Should the Company default in the payment or performance
of  any  of  the  Liabilities,  the obligations of the Guarantors hereunder with
respect  to  the Liabilities in default shall, upon demand by the Lender, become
immediately due and payable, without further demand or notice of any nature from
the Lender, all of which are expressly waived by the Guarantors. Payments by the
Guarantors  hereunder  may be required by the Lender on any number of occasions.
Capitalized  terms  used  herein  but  not  defined shall have the same meanings
ascribed  to  them  in  the  Note.

     The  Guarantors  have  agreed to execute and deliver each provision of this
Guaranty  jointly and severally in order to induce the Lender on the date hereof
to  countersign  the Note and thereby agree to advance funds to the Company from
time  to time pursuant thereto. Borrowings by the Company under the Note confers
a  substantial  direct  benefit  on  the  Guarantors.  The  Guarantors  hereby
acknowledge and agree that the foregoing constitutes full and fair consideration
and reasonably equivalent value for the obligations, covenants and agreements of
the  Guarantors  hereunder.

     "Lender" shall have the meaning assigned to such term in the Note.

     "Liabilities" shall mean all payments due under the Note, including without
limitation in respect of the indemnification obligations under Section 10 of the
Note,  the  Costs  of Company Collection and the Costs of Guarantors Collection.

     "Costs  of  Company  Collection"  shall  mean all costs and expenses of the
Lender  incurred  in connection with enforcement or collection under the Note in
accordance  with  Section  10 thereof, including, without limitation, reasonable
attorneys'  fees,  expenses  and  disbursements.

     "Costs  of  Guarantors Collection" shall mean all costs and expenses of the
Lender  incurred  in  connection  with  enforcement  or  collection  under  this
Guaranty,  including,  without  limitation, reasonable attorneys' fees, expenses
and  disbursements.

     The Guarantors will pay on demand interest on all amounts due to the Lender
under  this  Guaranty  from  the  time  the Lender first demands payment of this
Guaranty,  at  a  rate equal to the highest rate chargeable to the Company under
the  Note  as  of  such  time.

     The  obligations  of  the Guarantors hereunder shall not be affected by any
fraudulent,  illegal,  or  improper  act  by  the  Company,  nor by any release,
discharge,  or  invalidation,  by  operation  of  law  or  otherwise,  of  the
Liabilities,  or  by the legal incapacity of the Company, or any other person or
entity liable or obligated to the Lender for or on the Liabilities. Interest and
Costs  of  Company  Collection shall continue to accrue and shall continue to be
guarantied  hereby  notwithstanding  any stay to the enforcement thereof against
the  Company  or  disallowance of any claim therefor against the Company. If for
any reason the Company has no legal existence or is under no legal obligation to
discharge  any  of  the  Liabilities,  or  if any of the Liabilities have become
irrecoverable  from  the  Company  by  reason  of  the  Company's  insolvency,
bankruptcy, reorganization or by other operation of law or for any other reason,
this  Guaranty  shall  nevertheless  be  binding  on  the  Guarantors  as if the
Guarantors  had  at all times been the principal obligor on the Liabilities. The
obligations of the Guarantors hereunder shall remain in effect in the event that
acceleration  of  the  time for payment of any of the Liabilities is stayed upon
the  insolvency,  bankruptcy  or reorganization of the Company, or for any other
reason,  and  all such amounts otherwise subject to acceleration under the terms
of  any  agreement  or instrument evidencing or otherwise executed in connection
with the Liabilities shall be immediately due and payable by the Guarantors. The
amount payable by any Guarantor under this Guaranty shall not exceed the maximum
amount  that  could  then  be claimed under this Guaranty without rendering such
claim voidable or avoidable under Section 548 of Chapter 11 of the United States
Bankruptcy  Code  (11 U.S.C. 101 et. seq.) or under any applicable state Uniform
Fraudulent Transfer Act, Uniform Fraudulent Conveyance Act or similar statute or
common  law.

     This  Guaranty  incorporates  all  discussions and negotiations between the
Guarantors  and  the  Lender  concerning the guaranty provided by the Guarantors
hereby.  No  such  discussions or negotiations shall limit, modify, or otherwise
affect  the  provisions  hereof.  No  provision  hereof may be altered, amended,
waived,  cancelled  or  modified, except by a written instrument executed by the
Lender  and  each  Guarantor.

     The  Guarantors  waive  promptness, diligences, presentment, demand, notice
(other  than pursuant to the first paragraph hereof) and protest with respect to
the Liabilities or this Guaranty, and further waive any delay on the part of the
Lender,  and  further waive notice of acceptance of this Guaranty, notice of any
Liabilities  incurred  and all other notices of any kind, all defenses which may
be available by virtue of any valuation, stay, moratorium law or similar law now
or  hereafter  in  effect, any right to require the marshalling of assets of the
Company  or  any  other  entity  or  person primarily or secondarily liable with
respect  to  any  of  the  Liabilities,  and  all suretyship defenses generally.
Without  limiting  the  generality of the foregoing, the Guarantors agree to the
provisions of any instrument evidencing or otherwise executed in connection with
any  Liability  and agree that the obligations of the Guarantors hereunder shall
not be released or discharged, in whole or in part, or otherwise affected by (i)
the  failure of the Lender to assert any claim or demand or to enforce any right
or  remedy  against the Company or any other entity or other person primarily or
secondarily  liable with respect to any of the Liabilities; (ii) any extensions,
compromise,  refinancing,  consolidation or renewals of any Liability; (iii) any
change  in the time, place or manner of payment of any of the Liabilities or any
rescissions, waivers, compromise, refinancing, consolidation or other amendments
or  modifications  of  the  Note  or  any  other  agreement,  instrument or note
evidencing or otherwise executed in connection with any of the Liabilities; (iv)
the addition, substitution or release of any entity or other person primarily or
secondarily  liable  for  any  Liability; or (v) any other act or omission which
might  in  any  manner  or  to  any  extent  vary  the risk of the Guarantors or
otherwise  operate as a release or discharge of the Guarantors, all of which may
be  done  without  notice  to  the  Guarantors.

     The  obligations  of the Guarantors hereunder are primary, with no recourse
necessary  by  the  Lender  against  the Company prior to proceeding against the
Guarantors hereunder. The Guarantors agree that the Liabilities will be paid and
performed  strictly in accordance with their respective terms, regardless of any
law,  regulation  or  order  now  or  hereafter  in  effect  in any jurisdiction
affecting  any  of  such terms or the rights of the Lender with respect thereto.
The  Guarantors assent to any indulgence or waiver which the Lender may grant or
give  the  Company and/or any other person liable or obligated to the Lender for
or  on  the  Liabilities,  without notice to, or consent from the Guarantors. No
compromise,  settlement,  or  release by the Lender of the Liabilities or of the
obligations  of  any  such  other person (whether or not jointly liable with the
Guarantors)  shall affect the obligations of the Guarantors hereunder. No action
by  the Lender which has been assented to herein shall affect the obligations of
the  Guarantors  to  the  Lender  hereunder.

     This  instrument  shall  inure to the benefit of the Lender, its successors
and  assigns,  shall be binding upon the heirs, successors, representatives, and
assigns of the Guarantors, and shall apply to all Liabilities of the Company and
any  successor  to  the  Company,  including  any successor by operation of law.

     This  instrument  and  all  documents which have been or may be hereinafter
furnished by the Guarantors to the Lender may be reproduced by the Lender by any
photographic,  photostatic,  microfilm,  microcard,  miniature  photographic,
xerographic,  or  similar  process, and the Lender may destroy the original from
which such document was so reproduced. Any such reproduction shall be admissible
in  evidence as the original itself in any judicial or administrative proceeding
(whether  or  not  the  original  is  in  existence  and  whether  or  not  such
reproduction  was  made  in  the  regular  course  of  business).

     This instrument shall be governed, construed, and interpreted in accordance
with  the  laws  of  the  State  of  New  York without regard to conflict of law
principles  (except  for  New  York General Obligations Law Section 5-1401). The
Guarantors  submits  to  the  jurisdiction  of any federal, state or local court
located  in  the  State  of  New  York  for  all matters in connection with this
Guaranty  or  any  amendment  or  supplement  hereto  or  to  any transaction in
connection  herewith.

     It  is  the  intention  of the Guarantors that the provisions of the within
Guaranty be liberally construed to the end that the Lender may be put in as good
a  position as if the Company had promptly, punctually, and faithfully performed
all  Liabilities  and  the  Guarantors  had  promptly, punctually and faithfully
performed  hereunder.

     Any  determination  that  any  provision  herein  is  invalid,  illegal, or
unenforceable  in  any  respect  in  any instance shall not affect the validity,
legality,  or  enforceability  of such provision in any other instance and shall
not  affect  the  validity,  legality,  or enforceability of any other provision
contained  herein.

     Any  notice  from  the  Lender  to  the  Guarantors in connection with this
Guaranty shall be sent to the Guarantors at 13865 Sunrise Valley Drive, Herndon,
VA 20171. Any notice or communication pursuant or related to this Guaranty shall
be deemed given if in writing (i) when delivered in person, (ii) five days after
mailing  when  mailed  by  first  class  mail,  (iii)  when  sent  by  facsimile
transmission,  with  transmission  confirmed  or (iv) one day after sending when
transmitted  via  Federal  Express  or  other  overnight  courier  service.

     This  document  may  be executed in counterparts, each of which shall be an
original  but  all  of  which  together  shall  constitute  one  instrument.

     EACH  GUARANTOR  AGREES THAT NEITHER IT NOR ANY ASSIGNEE OR SUCCESSOR SHALL
(A)  SEEK  A  JURY  TRIAL  IN ANY LAWSUIT, PROCEEDING, COUNTERCLAIM OR ANY OTHER
ACTION  BASED  UPON  OR  ARISING  OUT  OF, THIS AGREEMENT OR THE DEALINGS OR THE
RELATIONSHIP  BETWEEN  THE GUARANTORS AND THE LENDER, OR (B) SEEK TO CONSOLIDATE
ANY SUCH ACTION WITH ANY OTHER ACTION IN WHICH A JURY TRIAL CANNOT BE OR HAS NOT
BEEN  WAIVED.

                            [SIGNATURE PAGE FOLLOWS]




     IN  WITNESS  WHEREOF,  the  undersigned has caused this Guaranty to be duly
executed  by  an  authorized  representative  as of the 8th day of October 2010.

XO HOLDINGS, INC.
TELECOMMUNICATIONS OF NEVADA, LLC
V&K HOLDINGS, INC.
XO INTERNATIONAL HOLDINGS, INC.
XO INTERNATIONAL, INC.
XO NEVADA MERGER SUB, INC.


By: /s/ Laura W. Thomas
    -------------------
    Name:  Laura W. Thomas
    Title:  Senior Vice President & Chief Financial Officer