WORLDCOM PROMISSORY NOTE

$3,456,151.56                                                December 15, 1998

      FOR VALUE RECEIVED, the undersigned, Incomnet, Inc., a California
corporation whose principal offices are located at 2801 Main Street, Irvine,
California 92614, and Incomnet Communications Corporation, a Delaware
corporation whose principal offices are located at 2801 Main Street, Irvine,
California 92614 (Incomnet, Inc. and Incomnet Communications Corporation shall
jointly and severally for purposes of this Worldcom Promissory Note be referred
to as the "Borrower"), HEREBY UNCONDITIONALLY PROMISES TO PAY to the order of
Ironwood Telecom, LLC, a Colorado limited liability company (the "Lender"), the
principal sum of THREE MILLION FOUR HUNDRED FIFTY-SIX THOUSAND ONE HUNDRED
FIFTY-ONE AND 56/100 DOLLARS ($3,456,151.56) (the "Worldcom Principal Amount")
plus all accrued and unpaid interest and fees thereon on the Maturity Date
(defined below).

      All capitalized terms not otherwise defined herein shall have the meaning
given such term in the Loan and Security Agreement, dated the date hereof, among
the Borrower, the Lender and Incomnet Communications Corporation (the "Loan
Agreement").

1.    PAYMENTS

      (a) As set forth above, the Principal Amount and all accrued and unpaid
interest and fees thereon shall be due and payable on the Maturity Date. As used
herein, "Maturity Date" means December 31, 2000.

      (b) The Borrower shall pay to the Lender interest on the unpaid Worldcom
Principal Amount at a per annum rate equal to twelve percent (12%). Interest
charges shall be computed on the basis of a year of 360 days and actual days
elapsed and shall be payable to the Lender quarterly in arrears on the last
Business Day of each Fiscal Quarter, with the first such payment of interest
becoming due and payable on March 31, 1999 ("First Payment"). Accrued interest
for the period from December 15, 1998 through December 31, 1998 shall be paid in
arrears along with the First Payment.

      (c) If any Event of Default occurs, then, from the date such Event of
Default occurs and until it is cured, or until all Obligations are paid and
performed in full, whichever first occurs, the Borrower shall pay interest on
the unpaid Worldcom Principal Amount at a per annum rate equal to three percent
(3%) plus the rate of interest otherwise specified herein as applicable to such
loan.

      (d) In no event shall the interest rate and other charges hereunder exceed
the highest rate permissible under any law which a court of competent
jurisdiction shall, in a final determination, deem applicable hereto. If a court
determines that the Lender has received interest and other charges hereunder in
excess of the highest rate applicable hereto, such excess shall be deemed to
have been received on account of, and shall automatically be applied to reduce,
the Worldcom Principal Amount in the inverse order of maturity, and the
provisions 




hereof shall be deemed amended to provide for the highest permissible rate. If
there is no Worldcom Principal Amount outstanding, the Lender shall refund to
the Borrower such excess.

      (e) The Borrower may prepay the Worldcom Principal Amount in whole or in
part at any time and from time to time, upon at least two (2) Business Days'
prior written notice to the Lender. All prepayments of principal shall be
accompanied by the payment of all accrued but unpaid interest on the prepaid
Worldcom Principal Amount to the date of prepayment. Any prepayment under this
section of less than all of the outstanding Worldcom Principal Amount shall be
applied, first, to accrued but unpaid interest on the Worldcom Principal Amount
and, second, to the Worldcom Principal Amount to be prepaid.

      (f) All payments of principal, interest, and other sums due to the Lender
shall be made at the following address:

            Ironwood Telecom LLC
            555 Zang Street, Suite 300
            Lakewood, Colorado  80228
            Attention:  John P. Hill

or such other address or bank account as may be designated by the Lender in
writing from time to time. All such payments shall be made in immediately
available funds. If any payment of the Worldcom Principal Amount, interest
thereon or other sum to be made hereunder becomes due and payable on a day other
than a Business Day, the due date of such payment shall be extended to the next
succeeding Business Day and interest thereon shall be payable at the applicable
interest rate during such extension.

      (g) This Worldcom Promissory Note is the Worldcom Promissory Note referred
to in the Loan Agreement. The Lender is entitled to the benefits and security
provided thereby or referred to therein, as well as all security relating to the
Security Agreement between Incomnet Communications Corporation (formerly known
as National Telephone & Communications, Inc.) and Worldcom Network Services,
Inc. dated June 1, 1996. All terms and conditions set forth in the Loan
Agreement with respect to the Amended and Restated Notes are incorporated herein
and made a part hereof. The Loan Agreement and this Worldcom Promissory Note are
secured by certain collateral more specifically described in the Loan Agreement.

2.    EVENTS OF DEFAULT

      Upon and after the occurrence of an Event of Default under the Notes or as
described in the Loan Agreement, the Lender shall have all of the rights and
remedies set forth in Section 11.2 of the Loan Agreement.

3.    FEES AND COSTS

      The Borrower shall pay to the Lender on demand all costs and expenses that
the Lender pays or incurs in connection with the negotiation, preparation,
consummation, administration, enforcement, and termination of this Agreement,
including, without limitation reasonable attorneys' and paralegals' fees and
disbursements of counsel to the Lender.


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4.    GOVERNING LAW

      THIS PROMISSORY NOTE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE
WITH, THE LAW OF THE STATE OF COLORADO, EXCEPT THAT NO DOCTRINE OF CHOICE OF LAW
SHALL BE USED TO APPLY THE LAWS OF ANY OTHER STATE OR JURISDICTION.

5.    NO RIGHT OF SET-OFF

      No set-off, counterclaim, reduction or diminution of any obligation, or
any defense of any kind or nature (other than performance by the undersigned of
its obligations hereunder) which the Borrower has or may have against Lender or
any affiliate or assignee thereof shall be available hereunder to the Borrower.

6.    WAIVER OF PRESENTMENT; CUMULATION OF REMEDIES

      All parties to this Worldcom Promissory Note, including the Borrower and
any sureties, endorsers or guarantors, hereby waive presentment for payment,
demand, protest, notice of dishonor, notice of acceleration of maturity, and all
defenses on the ground of extension of time for payment hereof, and agree to
continue and remain bound for the payment of principal, interest and all other
sums payable hereunder, notwithstanding any change or changes by way of release,
surrender, exchange or substitution of any security for this Worldcom Promissory
Note or by way of any extension or extensions of time for payment of principal
or interest; and all such parties waive all and every kind of notice of such
change or changes and agree that the same may be made without notice to or
consent of any of them. The rights and remedies of the holder as provided herein
shall be cumulative and concurrent and may be pursued singularly, successively
or together at the sole discretion of the holder, and may be exercised as often
as occasion therefor shall occur, and the failure to exercise any such right or
remedy shall in no event be construed as a waiver or release of the same.

INCOMNET, INC.

By: /s/ Denis Richard
    -------------------------------------------
    Denis Richard
    Its:  President and Chief Executive Officer


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