No signal on iPhone 4S, weird problem!
I got my iPhone 4S today. I inserted my sim-card from my iPhone 4, but I got no signal. Sometimes it get signal a few seconds before it says "No service".
Then I tried to insert another sim-card from a friend, and then it worked fine.
To check it wasn't an operator lock or something, I inserted my sim-card into his iPhone, and surprisingly it worked.
I would appreciate you'r help if you know something about this!
By the way - I've tried to restore network settings multiple times with no sucess.
iPhone 4S, iOS 5.0.1