Mobile subscribers grew in double digits up to the third quarter of 2011.
The mobile market is shared between five operators, Malaysia's Axiata, UAE's Etisalat, Sri Lanka Telecom Mobitel which is part owned by Malaysia's UT group, India's Airtel and Hutchison Telecom.
Fixed access wireless users grew 0.6 percent to 2.65 million rupees in the first quarter from a year earlier but dropped from 2.66 million in the last quarter of 2012.
Sri Lanka's wireline users, who are customers of Sri Lanka Telecom, grew 5.5 percent to 958,038 by the end of the first quarter.
Wireline use picked up after Sri Lanka Telecom started to promote broadband.