How do I clear an intermittent "Invalid SIM" error message on iOS?

Question

How do I troubleshoot and permanently fix an intermittent "Invalid SIM" or "SIM Not Valid" popup message on an iPhone? View technical guides on iPhones PK online Apple store.

apple_fixer_pro · Answer

An intermittent "Invalid SIM" alert is commonly caused by physical contact degradation or dust built up inside the SIM slot. Eject the SIM tray, inspect the physical nano-SIM chip for scratches, and clean the gold contacts gently using a microfiber cloth or isopropyl alcohol swab before reinserting.

Cleaning Physical SIM Card Tray Contacts

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How do I clear an intermittent "Invalid SIM" error message on iOS?

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