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My iphone does not recognize the sim card
iPhone 12 Pro Max, iOS 15
Depending on the exact message you’re seeing, it might indicate that perhaps your phone is locked to a carrier OTHER that the carrier of the SIM you’ve installed.
Only the “locking carrier” can release the lock.
How to unlock your iPhone for use with a different carrier - Apple Support
If you see 'invalid SIM' or 'no SIM' on your iPhone or iPad.
If you see 'invalid SIM' or 'no SIM' on your iPhone or iPad - Apple Support
My iPhone does not recognize the SIM card
