how can I fix sim not supported on my Iphone 8 plus?
How can i fix sim not supported on my Iphone 8 plus?
iPhone 8 Plus, iOS 15
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Perhaps that iPhone is locked to a specific carrier. Should be this case, only that carrier can unlock your device, if you're eligible.
See also this support article:--> How to unlock your iPhone for use with a different carrier - Apple Support
Regards
Giulio