Carrier Issues

SIM Card Not Working on Android or iPhone

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Quick Answer When your phone displays No SIM, Invalid SIM, SIM Failure, or cannot connect to the carrier, first restart the phone and confirm that Airplane Mode is off. For a physical SIM, power the phone off and carefully reseat the card. Then test the SIM in another compatible phone or test a known-working SIM … Read more

Mobile Data Keeps Disconnecting on Android: How to Fix It

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If your Android phone keeps losing mobile data and then reconnecting, first determine what actually disappears: the 4G/LTE/5G data connection, the signal itself, or only internet access. Start by turning off Wi-Fi, checking your mobile-data connection, briefly using Airplane Mode, testing another location, and checking whether another phone on the same carrier has the same … Read more