My phone was sitting idle all day yesterday. In the morning it had network. In the evening when I tried to make a call it didn't. Restarted the phone and it said "SIM card registration failed". Tried changing from 3G to GSM, didn't work. I put the SIM in another phone and it works fine so it's a problem with the phone.

Calling my network provider, Orange (UK) seemed to confirm this as they said the card is registered. Oh and I am on the global firmware (but that was aaaages ago, and it has worked since the flash).

Does anyone have any idea what could be causing this? It seems kind of random, as far as I can remember I didn't touch it all day...

I wish I was smart enough to figure this out myself, and not have to bother you guys. Hopefully you enjoy the challenge of figuring it out If you need any further info please ask.

Thanks in advance!