How do I know if my iPhone 11 Pro is locked or unlocked?
How do know or tell if my iPhone 11pro is locked to a carrier or unlocked?
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Tap Settings > General > About
Scroll down to Carrier Lock
If the phone is unlocked, you will see No SIM Restrictions
If you see SIM Locked, the phone is locked to the carrier. You will have to contact the carrier to get the phone unlocked.