Contact service provider. The SIM card may be burnt out
Lol jabrashaw! Sprint phones don't have SIM cards unless it's an international device, and the sph m620 is not. There is no way to unlock it. If it's still under warrenty or you have TEP insurance than it can be replaced at no charge. If they don't have it in stock it can take 3-5 buisness days to get the upsage replacement.
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thanks but dey unlocked my phone at the sprint store free of charge n no master reset
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