How unlock may locked sim
How to unlock my locked SIM
iPhone 7, iOS 15
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See this Apple article: Use a SIM PIN for your iPhone or iPad
https://support.apple.com/en-us/HT201529
or:
See this Apple article: How to unlock your iPhone for use with a different carrier
https://support.apple.com/en-us/HT201328
Apple can't unlock your iPhone for use with a different carrier. Only your carrier can unlock your iPhone.