“I firstly got a defect product which always go dead at ~30% battery automatically. So I replaced it with a new one. But after I inserted my SIM card, it can't read my data plan. It shows well connection but actually no internet. Anything I can do?”
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It sounds like the SIM card may be the problem. Perhaps you can visit an AT&T store to have this checked, and they can swap your SIM card with a good one. Good luck!
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