Unlocked iphone 11pro max
How to unlocked a sim card
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If it the actual SIM that is locked, you need to contact the carrier about the PIN or PUK. If you are asking about a phone that is giving you a warning that the SIM you are trying to use is unsupported, that means that the iPhone is locked to a carrier other than the one you are trying to use the SIM for. See this about getting your iPhone unlocked to be used on another carrier. How to unlock your iPhone for use with a different carrier - Apple Support