Glitch leaves millions of O2 users without phone service Initially O2 promised to have the problem fixed by 4.30pm but the issue remained unresolved some time after that."We believe we have now identified the cause of the fault and are taking corrective action to restore service to those customers affected," it said in a statement issued in the afternoon. We are sorry for any inconvenience this may be causing. The company gave no reason for the outage. Customers talked of its network simply "disappearing" in parts of the country. A spokesman for O2 told Mobile, a magazine for the mobile phone industry, that the problem was not confined to one area of the UK. One customer on the O2 community forum wrote: "No signal in Worcestershire for the last couple of hours! A bit fed up with all the saga of poor service from O2. It isn't the first time and gets too frequent to tolerate. Another wrote: "Same problem with calls, texts and 3G here in Hert­ford­shire." According to the BBC, the high number of customers checking to see if there were any problems near them also caused problems for O2. A tool that let people type in their postcode and find out local problems stopped working. The network problems come at a delicate time for O2, which along with other companies is planning to roll-out its 4G coverage. In July a 24-hour blackout left millions of its customers unable to receive calls or text messages. However, the company said that yesterday's fault was not caused by the same problem. Pay-as-you-go customers had 10 per cent of usage added their phone when they topped it up. A customer called Lucie Jones said on Twitter: "O2 ... You're having a shocking year.