Terrible service from O2. I have been the victim of identity fraud and various O2 accounts have been opened in my name. I have had to call them 3 times and been fobbed off. Apparently it takes them months to investigate fraud and all the while I am receiving debt enforcement letters. O2's conduct of this matter has been far worse than Vodafone, which dealt with the same situation much more efficiently. I would never use them as my mobile provider.