Unlock SIM card
I bought this iphone 3 years ago online fully unlocked but safe link or idk now has my sim locked not even from them
iPhone 6s Plus, iOS 15
I bought this iphone 3 years ago online fully unlocked but safe link or idk now has my sim locked not even from them
iPhone 6s Plus, iOS 15
PUK? Contact your carrier. Read for more...
If you forgot or don't know your SIM PIN
Never try to guess a SIM PIN or PUK code.* The wrong guess can permanently lock your SIM card, and then you would need a new SIM card. If your device asks for a PIN or code that you don't know, here's what to do:

*If you enter the wrong SIM PIN too many times, your wireless carrier might be able to give you a Personal Unlocking Key (PUK).
PUK? Contact your carrier. Read for more...
If you forgot or don't know your SIM PIN
Never try to guess a SIM PIN or PUK code.* The wrong guess can permanently lock your SIM card, and then you would need a new SIM card. If your device asks for a PIN or code that you don't know, here's what to do:

*If you enter the wrong SIM PIN too many times, your wireless carrier might be able to give you a Personal Unlocking Key (PUK).
Carrier Lock:- Request your iPhone’s original Carrier to unlock your iPhone and if they agree and do it, then you may know the further process here --> How to unlock your iPhone for use with a different carrier ...
Device Unlocking Policies | Verizon Privacy Policy
Unlock a Phone or Device - AT&T Device Unlock Portal
Unlock SIM card