NOTICE OF GUARANTEED DELIVERY
U.S.$750,000,000 5.000% Senior Notes due 2019,
which have been registered under the Securities Act of 1933,
for any and all outstanding unregistered 5.000% Senior Notes due 2019,
América Móvil, S.A.B. de C.V.
unconditionally guaranteed by Radiomóvil Dipsa, S.A. de C.V.
pursuant to the prospectus dated , 2010
As set forth in the prospectus, dated , 2010 (the “ Prospectus ”), of América Móvil, S.A.B. de C.V. (the “
Company ”), in the accompanying Letter of Transmittal and instructions thereto (the “ Letter of Transmittal ”), this form or one
substantially equivalent hereto must be used to accept the Company’s offer to exchange (the “ Exchange Offer ”) up to an
aggregate principal amount of U.S.$750,000,000 of its 5.000% Senior Notes Due 2019 (the “Exchange Notes”) for a like principal
amount of its outstanding unregistered 5.000% Senior Notes due 2019 (the “Original Notes”), if (i) certificates representing the
Original Notes to be tendered for purchase and payment are not lost but are not immediately available, (ii) time will not permit
the Letter of Transmittal, certificates representing such Original Notes or other required documents to reach The Bank of New
York Mellon (the “ Exchange Agent ”) prior to the Expiration Date (as defined below) or (iii) the procedures for book-entry
transfer cannot be completed prior to the Expiration Date. This form may be delivered by an eligible institution by mail or hand
delivery or transmitted, via telegram, telex or facsimile, to the Exchange Agent as set forth below.
For information, contact:
Delivery to the Exchange Agent, The Bank of New York Mellon:
Delivery of this instrument other than as set forth above will not constitute a valid delivery.
This form is not to be used to guarantee signatures. If a signature on the Letter of Transmittal is required to be guaranteed
by an “eligible institution” under the instructions thereto, such signature g