September 2005

0872 — Live Talk 18+

Make your dreams come true! Call 0872!

i-mode™ in Russia!

From September 15, 2005, the new revolutionary i-mode service will be available to MTS users – and i-mode traffic will be free until October 15, 2005!

0747 — Erotic Talk

MTS offers its users the new Erotic Talk voice service.

0779 — “Voice Pictures” Congratulation Service

From September 19, 2005, MTS offers its users the new Voice Pictures voice service, allowing them to congratulate friends on festive occasions by simply calling 0779.

0715 — Fortune Line

MTS’ Fortune Line offers its users contact with the mysterious and unknown world of magic, astrology and number forecasts.

MTS Announces Subscriber Growth Numbers for August 2005

Moscow, Russian Federation — September 8, 2005 — Mobile TeleSystems OJSC (“MTS” — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that its consolidated subscriber base reached 48.33 million users on August 31, 2005.

0934 — Surprise a Friend and Win a Prize!

From 7 to 19 September 2005, MTS’ Song as a Gift users will have a chance to win a prize!

0676 — Hunger

Support your favorite Hunger 2 TNT participant! Call 0676!

MTS’ New Sales and Customer Care Office in Shchelkovo

MTS is pleased to announce the opening of the new sales and customer care office in the Moscow region, Shchelkovo.

0940 — Useful Information and Positive Emotions!

MTS offers its users a new helpful and cheerful voice service!

MTS’ New Ring Tone Service: GOOD’ OK!

From September 4, 2005, MTS’ new GOOD, OK! service will allow its users to personalize their ring tones.

SMS Quiz: Two VIP-Zone Tickets for KORN!

The Alternative is Here! The Alternative SMS Quiz! The First National Award for Alternative Music!

MTS-Search: Mobile Child

MTS-Search’s Mobile Child service allows its users to receive information on their child’s location anywhere in Moscow and the Moscow region whenever needed. The parents and children only need to have a mobile phone.

MTS-Search: Mobile Angel

MTS-Search’s Mobile Angel service allows loving and caring parents and children to find out where their children or parents are at any time.

Participate in Number Mania and Turn Digits into Prizes!

1 to 30 September: Number Mania — turn digits into prizes!

0771 — “At Leisure” Entertainment Portal

From September 1, 2005, MTS offers its users the new At Leisure entertainment portal on 0771.

0962 — New Life

One number for the most popular melodies, ring tones and mobile games.

EDGE for MTS Users!

From September 1, 2005, MTS users in the Moscow region will be able to access the highest mobile data rates available using EDGE (Enhanced Data for Global Evolution) technology.

0609 — Mobile Autoradio Service!

Call quick dial 0609 for traffic information in Moscow and other car news broadcasted by Autoradio!

0909 — More Information for Two Capitals!

Call quick dial 0909 for access to MTS' Single Information and Customer Service.

Contact investor relations:

+ 7 495 223 20 25

MTS Investor Relations
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