I have searched all the forums and did not find this covered. Do not know if this happens to others too.

I often travel between two cities ( Mumbai and Pune ) and the network provider changes. As soon as I enter the city, when I try to make a call the system hangs and does not connect.

When I press the 'Hang up' icon the system reboots. This happens for quite a few times until normalcy is restored.

I have so far tried:

1. Manually choosing networks.
2. Changing networks.
3. Running a few other applications before coming back to Phone.
4. and AH...resetting.

None of them work.

Any clues?