![]() If another SIM card was used with this iPhone until recently (even if its contract expired), the iPhone may need this particular SIM card to be activated. After all, messages such as “SIM Not Valid” can also appear when a SIM card is damaged. Perhaps the one you already used caused the issue. ![]() You may need to replace your current SIM card. Contact your Carrier and check for activation or network problems. Make sure the SIM card that you inserted is still active with your mobile network. Sometimes using a card from a different iPhone model or another smartphone manufacturer can cause an Invalid SIM Card issue. Make sure the SIM holder closes correctly. Make Sure the SIM Card is Active and WorksĪs obvious as it may sound, remove the SIM card from the SIM tray, and then reinsert it.
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