O2 continued to shed home broadband customers during the fourth quarter of 2012, it has been reported.
The broadband provider experienced a net fall of 19,400 subscribers between October and December last year.
At the end of 2012, the firm had 560,100 fixed-line broadband customers, down from 579,500 in the third quarter of the year.
Subscriber levels peaked in December 2010 when the firm registered 671,600 customers. However O2 has faced stiffer competition in recent times.
The absence of an O2 super-fast fibre service may have encouraged consumers to switch to another broadband provider.
A number of rival operators, including BT, Sky, TalkTalk, Virgin Media and Plusnet, now offer fibre broadband services capable of delivering faster download and upload speeds.