Rightio, having just recovered from a panic attack, I come here, seeking your help! At the end of October, my iPhone 4 was replaced, with a replacement (obviously). The phone looked fine, and so I took it home, but in the last two weeks I've got a message 5 times, saying "Restore Needed. iPhone cannot make or receive calls. Restore in iTunes." but upon every restart, it's all gone back to normal. 3 of these times, I was on 4.1 and 2 have been on 4.2, but today when I restarted, it came up with a plug into iTunes message when it turned back on (as in, black screen, USB and the hideous iTunes logo), clicking the i just said that the serial number and IMEI were unknown, panicking, I plugged it into iTunes, which came up with a message saying iTunes could not recognise it because it had a passcode, but I couldn't unlock it! Now, even more stressed, I again restarted my phone, it turned on (phew), half synced, stopped, the storage bar said my phone was full, even though it wasn't last time I synced, I had a good 4 or 5 GBs left. After about 5 minutes, the phone alerted me to the fact that that it was now activated (?) and ever since, there's been a spinning circle in my status bar thing at the top. For a phone, the iPhone sure does make difficult work of being a phone! So yes, I'm in a bit of a kerfuffle, could anybody give me any idea of what I should do? It's snowing here in England at the moment, I don't want to go out tomorrow, get stuck, and my phone decide it's not going to work anymore, what do I do!? Help!!!