asmcar:lokhor: It does sound worrying. I'll ask my mate if it happens to him. I've heard of similar things happening on other phones and its usually due to a damaged sim.
Cheers for that mate. Brand new sim when I bought the phone so wouldn't think it would be that. But you never know I may have damaged it when I put it in.
Just out of curiosity why not go on 2Degrees?
Edit: just received a reply from my friend, he's on 2Degrees with the X5 and says that it only goes to emergency calls only in elevators or underground and reconnects by itself with no problems.