No clue at this point if its the network or the mobile!
Im on one so badly! I've just given o2 and the carphone warehouse a right good going at! o2 said they couldn't confirm if a problem with network at this point or my phone and my phones an old one because the carphone warehouse gave me a dodgy phone which failed to work whist I was in hospital so they fixed it & it broke again in a matter of 2 weeks ffs - same problem! Woman at the carphone warehouse wouldn't talk to me any more - dunno why

HA!