Ofcom has published the fourth edition of its quarterly UK telecoms complaints data. The report covers the final three months of 2011.

As with previous periods, overall mobile complaint levels were much lower than for fixed-line telephones and fixed broadband services. For the Q4 2011 period, Ofcom received the fewest complaints about O2 and the most complaints about Orange.

This increase in complaints about Orange was driven by the company’s decision to increase the prices of ‘pay monthly’ tariffs for all customers. As a result it overtook Three UK, which had been the most-complained about mobile network for the previous three quarters.

TalkTalk generated the highest number of complaints about fixed-line telephone and broadband service in the quarter.

A total of 112,750 complaints about fixed-line, broadband and mobile services were received by Ofcom in the last financial year; an average of over 300 per day.

[Ofcom report (pdf)]