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When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
I have had an iPhone 6 for several years before my mom bought a SIM card for it. I tried inserting the SIM card but the SIM card not supported keeps on popping up. I checked the carrier for my phone and the SIM card and they both fall under AT&T. My little sister's iPhone 6 (which was bought together with mine) activated immediately. I'm not sure if it's an unlocking issue or what else it could be.
Learn what to do if you see a SIM not supported alert.
Learn what to do if you see a SIM not supported alert.
SIM card not supported
