Maxcom Telecommunications (MXMTY) SC TO-T Third party tender offer statement

(a)(1)(F)

INSTRUCTION FORM FOR ADSs OF MAXCOM TELECOMUNICACIONES, S.A.B. DE C.V.  IN THE U.S. OFFER

The undersigned acknowledges receipt of your letter and the enclosed materials referred to therein related to the U.S. Offer by Banco Invex S.A., Institución de Banca Múltiple, Invex Grupo Financiero, a banking institution organized and existing under the laws of the United Mexican States, acting as Trustee for Trust 1387 (“Purchaser”) to purchase all the outstanding ADSs, all the outstanding Ordinary Participation Certificates and all the Series A Common Stocks of Maxcom Telecomunicaciones, S.A.B. de C.V. held by persons who are not Mexican residents.

This will instruct you to tender or convert the number of ADSs indicated below (and if no number is indicated, all ADSs) held by you for the account of the undersigned in accordance with the terms and subject to the conditions set forth in the U.S. Offer to Purchase and in the ADS Letter of Transmittal.

	Please tender the ADSs held by you for my account as indicated below:
o	Please tender                            ADSs
		[NUMBER OF ADSs]
o	Please DO NOT tender any ADSs held by you for my account.
	Please convert the ADSs held by you for my account into Series A Common Stocks as indicated below:
o	Please convert                            ADSs into Series A Common Stocks
		[NUMBER OF ADSs]
	Please convert the ADSs held by you for my account into Ordinary Participation Certificates as indicated below:
o	Please convert                            ADSs into Ordinary Participation Certificates
		[NUMBER OF ADSs]
o	Please DO NOT convert any ADSs held by you for my account.
Date:
Signature(s):
Print Name(s) here:
Print Address(es):
Area Code and Telephone Number(s):
Tax Identification or Social Security Number(s):

NONE OF THE ADSs HELD BY US FOR YOUR ACCOUNT WILL BE TENDERED OR CONVERTED UNLESS WE RECEIVE WRITTEN INSTRUCTIONS FROM YOU TO DO SO.  UNLESS A SPECIFIC CONTRARY INSTRUCTION IS GIVEN IN THE SPACE PROVIDED, YOUR SIGNATURE(S) HEREON SHALL CONSTITUTE AN INSTRUCTION TO US TO TENDER ALL THE ADSs HELD BY US FOR YOUR ACCOUNT.