Telkomsel is the leading operator of cellular telecommunications services in Indonesia by market share and revenue share.

By the end of March 2009, Telkomsel had 72.1 million customers which based on industry statistics represented an estimated market share of approximately 50%.

Telkomsel provides cellular services in Indonesia, through its own nationwide dual-band GSM 900-1800 MHz, 3G network, and internationally, through 341 international roaming partners in 180 countries (end of March 2009). In September 2006, Telkomsel became the first operator in Indonesia to launch 3G services.