MTS is the largest mobile operator in Russia and CIS with over 102.4 million subscribers as of 31 December 2009.
The MTS mobile network operates using the GSM standard. It currently holds licences to provide mobile services in 81 out of 83 regions in Russia and the entire territories of Armenia, Ukraine, Belarus, Uzbekistan, Turkmenistan. MTS is currently the biggest mobile operator in Central and Eastern Europe.