LETTER TO CLIENTS
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
To Our Clients:
We are enclosing herewith the prospectus dated , 2010 of América Móvil, S.A.B. de C.V. (the “Company”),
which, together with the accompanying Letter of Transmittal and the instructions thereto (the “Letter of Transmittal”),
constitutes 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”) that have been registered under the Securities Act of 1933, as
amended (the “Securities Act”), for a like principal amount of its outstanding unregistered 5.000% Senior Notes due 2019 (the
“Original Notes”), upon the terms and subject to the conditions set forth in the Exchange Offer.
Please note that the Exchange Offer will expire at 5:00 p.m., New York City time, on , 2010 unless it is extended.
The Exchange Offer is not conditioned upon any minimum number of Original Notes being tendered.
We are the holder of record and/or participant in the book-entry transfer facility of Original Notes held by us for your
account. A tender of such Original Notes can be made only by us as the record holder and pursuant to your instructions. The
Letter of Transmittal is furnished to you for your information only and cannot be used by you to tender Original Notes held by
us for your account.
We request instructions as to whether you wish to tender any or all of the Original Notes held by us for your account
pursuant to the terms and conditions of the Exchange Offer. We also request that you confirm that we may on your behalf make
the representations contained in the Letter of Transm