SIM Card Not Working on Android or iPhone

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

Android SIM Card Not Detected? 9 Ways to Fix No SIM

If your Android phone says “No SIM,” “SIM card not detected,” “No SIM card,” or “Insert SIM,” the phone is not properly recognizing the SIM or connecting it to the mobile network. The fastest way to find the cause is to restart the phone, check the SIM, and then test the SIM in another compatible … Read more