This happens about 25% of the time. I 'll dial a number of a regular contact. the phone will say 'dialling' but I'll not hear it ringing. After about 20 seconds I'll hear a 'ding' and see 'call ended' When talking to the person I tried to call, they say that their phone never rang. I've also has the reverse. someone rings me, they hear it ringing for a while before going to voicemail. My phone hasn't rung, neither do I see any missed calls. In both cases I'm seeing a strong signal and have a good amount of charge in the battery. When I called the carrier (Virgin Mobile UK) they said there were no network problems. Has anyone else had a similar experience or do I have an intermittent fault?