iPhone 6s sim not valid
My sim is suddenly no longer supported by my iPhone, check out the message I’m getting and I have contacted my service provider and they said my sim is ok and no problem was detected, can someone please help.
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That means that your phone is carrier locked and that you are trying to use a Sim Card that is not associated with that carrier. You will need to contact the carrier the phone is locked to and see if you can get it unlocked. If you don't know who the carrier is, you can contact Apple support to find out that information.