The Telecommunication Regulatory Authority (TRA) has announced an increase in subscriber complaints against service providing firms, with the number seeing a 25 % rise in 2013 from 2012 and a massive 277 % since 2011, Muscat Daily reported. The complaints have steadily risen over the past three years from 31 in 2011 to 93 in 2012 and 117 in 2013. TRA in its 2013 annual report, attributes this rise to increased consumer rights awareness and the launch of its call centre last year. As high as 93% of the total 117 complaints registered in 2013 had been made by individual subscribers. Maximum complaints - 70.% or 83 from the total 117 - were against Omantel in 2013; 26.5% (31) were against Nawras, the report says. There was one complaint each against Injaz, Samatel and Renna. The report says that most complaints were over mobile services (65%) followed by those about Internet services (30%).