iPhone 12

Grace-04 Said:

"iPhone 12: If you get a used phone Can you use the phone if the carrier is different?"

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Using a Different Carrier on a User iPhone:

Only if you have services with that Carrier. You'd call them, setting this up, through the SIM card, which they, themselves, would configure.

You will need to contact the carrier that the phone is currently locked to and ask them if they will unlock it.