Telstra’s full-year profits have fallen 8.4% to $3.6 billion, a result of the impact of the national NBN rollout.

Competition for mobile customers is also threatening Telstra’s profits, however they have managed to keep their sales revenue flat at $26 billion dollars.

Chief executive of Telstra, Andy Penn, says that competition in the mobile market is increasing, with the expected entrance of a fourth mobile network operator.