The sim is not detecting

Iphone 3gs   the sim is not detecting n its says no service .. i got it to a repair shop they fixed it i changed the software and now the sim is not detecting it says no service   ..... replay please

Take it back to the "repair center" and tell them to either fix or replace it with an unaltered device.
iPhones are not user repairable.  Apple does not authorize anyone but Apple to replace iPhones.  Apple does not repair iPhones.

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