Moscow, Russian Federation — April 20, 2007 — Mobile Telesystems OJSC («MTS» — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that the Company won an IMT-2000/UMTS (3G) Federal license for the entire territory of Russia.

Today the Russian Ministry of Information and Communications announced the results of a tender for the 3G license. MTS was one of three companies that received a federal license allowing it to provide 3G services in Russia. In accordance with the conditions set forth in the tender documentation, the winning companies are required to begin commercial exploitation of a 3G network in the period of two years from the time they receive the license.

MTS’ 3G network will be using the 1950-1965 MHz, 2015-2020 MHz and 2140-2155 MHz frequencies. MTS subscribers will benefit from the high-speed data transmission using HSDPA technology and will be offered a number of new and innovative services such as video calls, video conferencing, mobile television and many others.

«We are very pleased to have received the 3G license. This will provide the Company with a further impetus in its development and will allow us to introduce to our customers exciting new and convenient products and services. The new technologies will make communicating more fun and productive for our customers,» commented President and CEO of MTS, Leonid Melamed.

The 3G network in Russia will compliment the existing GSM network. The Company is planning to launch 3G services in the largest cities in Russia starting from the second half of this year.