Moscow, Russian Federation — August 11, 2006 — Mobile Telesystems OJSC («MTS» — NYSE: MBT), the largest mobile phone operator in Russia and the CIS, announces that its consolidated subscriber base reached 65.72 million users on July 30, 2006.

During July 2006, MTS’ consolidated subscriber base increased by 1.62 million subscribers, of which 1.15 million were added in Russia.

Subscribers (mln)	July 31, 2006	June 30, 2006	Growth Subs	Growth %	July 31, 2005	Growth Subs	Growth %
Total consolidated subscribers, end of period	65.72	64.10	1.62	2.5%	46.37	19.35	41.7%
Russia	49.19	48.04	1.15	2.4%	35.74	13.45	37.7%
Moscow and the Moscow region	10.81	10.64	0.17	1.6%	9.12	1.69	18.6%
St. Petersburg and the Leningrad region	2.61	2.59	0.02	0.9%	2.18	0.43	19.7%
Rest of Russia	35.77	34.82	0.95	2.7%	24.44	11.33	46.4%
Ukraine	15.50	15.11	0.39	2.6%	10.14	5.36	52.9%
Uzbekistan	0.89	0.82	0.07	8.8%	0.43	0.46	108.1%
Turkmenistan	0.13	0.12	0.008	6.7%	0.06	0.07	116.8%
MTS Belarus1	2.68	2.58	0.10	3.9%	1.69	0.99	58.8%