Sri Lanka has seen a steep drop in the use of mail in 2011, while telecom services continued to expand, increasing losses of a state-run postal service.
Central Bank data showed that letters per inhabitant dropped to 33.3% to 12 in 2011 from 18 a year earlier.
Per capita letter use also dropped 10% in 2010 over 2009.
While mail use dropped, telephone density rose to 105.1 lines per 100 persons from 100.7 a year earlier.
Mobile phones rose 6.1% to 18.319 million and fixed lines rose 2.9% to 942,000.