Four things it could be are: 1. You are in an area that doesn't provide service for the sim card you have inserted. 2. There is a bad connection inside the phone between the antenna and the main board. 3. If it is locked for a network and a different network's sim card is inserted it may cause this problem. 4. A problem with the main board or the firmware could be the culprit. ---------------------- Unfortunately, unless you have experience with these phones it will be difficult to diagnose which is your problem.
Answers & Comments
Four things it could be are:
1. You are in an area that doesn't provide service for the sim card you have inserted.
2. There is a bad connection inside the phone between the antenna and the main board.
3. If it is locked for a network and a different network's sim card is inserted it may cause this problem.
4. A problem with the main board or the firmware could be the culprit.
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Unfortunately, unless you have experience with these phones it will be difficult to diagnose which is your problem.