Solved! I'm using lenovopb2670m .my sim is working in other mob but not in my mob

[gagoojaan777]

I'm using lenovopb2670m .my sim is working in other mob but not in my mob

 

[Saga Lout]

The "other" mobile might not be restricted to a certain Service Provider but the one you want to use is.

 

[webworkings]

Are you sure the new and old carrier/service provider run on the same network? If one is CDMA and the other GSM, that will make it not work as well.