LETTER TO REGISTERED HOLDERS
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 Registered Holders:
We are enclosing herewith the material listed below relating to the offer to exchange (the “Exchange Offer”) by América
Móvil, S.A.B. de C.V. (the “Company”) up to an aggregate principal amount of U.S.$750,000,000 of its 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 prospectus (the “Prospectus”) dated , 2010, and the accompanying
Letter of Transmittal and instructions thereto (the “Letter of Transmittal”).
Enclosed herewith are copies of the following documents:
2. Letter of Transmittal;
3. Notice of Guaranteed Delivery;
4. Instruction to Registered Holder and/or Book-Entry Transfer Participant from Beneficial Owner; and
5. Letter which may be sent to your clients for whose account you hold Original Notes in your name or in the name of
your nominee, to accompany the instruction form referred to above, for obtaining such client’s instruction with regard to
the Exchange Offer.
We urge you to contact your clients promptly. 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.
Pursuant to the Letter of Transmittal, each holder of Original Notes (a “Holder”) will represent to the Company and