Net income decreased by 34.7% year-on-year in the first quarter of 2011 from US$24.5 million to US$16 million.

Total revenue from value added services made up US$17.8 million in the first quarter of 2011. At the same time, revenue from message transfer reached US$6.4 million (-7%), from data transfer – US$5.2 million (+79%) and from content services – US$3.8 million (-30%).

OIBDA made up US$57 million in the first quarter of 2011. OIBDA margin decreased from 54.6% in the first quarter of 2010 to 54.1% in the same period of 2011. Operating income before depreciation and amortization (OIBDA) represents operating income before depreciation and amortization. OIBDA margin is defined as OIBDA as a percentage of net revenues.

ARPU made up US$3.9 in January-March 2011, while it was US$4.8 in the same period of 2010. Average monthly service revenue per subscriber (ARPU) is calculated by dividing service revenues for a given period, including interconnect and guest roaming fees, by the average number of our subscribers during that period and dividing by the number of months in that period.

The MOU fell from 520 minutes in the first quarter of 2010 to 402 minutes in the same period of 2011. Average monthly minutes of usage per subscriber (MOU) is calculated by dividing the total number of minutes of usage during a given period by the average number of our subscribers during the period and dividing by the number of months in that period.

SAC grew from US$6.1 in the first quarter of 2010 to US$7.4 in the same period of 2011. Subscriber acquisition cost (SAC) is total sales and marketing expenses and handset subsidies for a given period. Sales and marketing expenses include advertising expenses and commissions to dealers.

Churn rate made up 9.2% in the first quarter of 2011 against 5.9% in the same period of 2010, MTS reported.

The subscriber base of MTS Uzbekistan rose from 7.4 million in the first quarter of 2010 to 9.1 million in the same period of 2011.

The capital investments of MTS in Uzbekistan totalled US$16.4 million in January-March 2011 and US$23.9 million in the same period of 2010.