Mobile operator O2 suffered a disruption in service yesterday, just weeks before networks are expected to face a jump in demand from the London Olympics.

O2, owned by Spain's Telefonica, said on its website on Wednesday that it had a problem on its network causing some customers to have difficulty making or receiving calls, sending texts or using data.

Its engineers were dealing with the problem and the company hoped to restore full service as soon as possible, according to an update on the 02 website.