i have the following issue:

A friend which is about 500 Miles away got an US 1.1.1 phone which wasn't working with his T-Mobile SIM but was activated, so my guess was that it wasn't unlocked yet.

I guided him over the phone to get Installer on it and AnySIM 1.1p which gave him a success message, but he was telling me that he is not able to call - there is only one small signal bar and no carrier displayed.

He told me something about a message "other sim detected please connect to itunes".

What does that mean, i never had that with my phone. Any tips for me what he has to do next?