My iPhone (which is jailbroken at 3.1.2 but using a proper O2 iPhone SIM) was charging overnight but when I woke up this morning I had no service and the screen was showing the 'connect to itunes' image and the swipe said 'slide for emergency'. I connected my iPhone to iTunes and it said "itunes cannot connect to iphone because it is locked with a passcode". I do use a passcode lock on my iphone however I had been asleep and had not entered it and there was no way to enter it. I put the phone into DFU mode and restored the firmware however now it will not activate - itunes says "itunes cannot activate your iphone because the sim card is not inserted or a sim pin is required". I have rebooted the phone and removed and replaced the SIM card but still the same problem. Any help would really be appreciated.