I format my XR so my sim did not work anymore it’s show sim locked what’s can I do to it I can’t use sim on it I can only connect to Wi-Fi
[Re-Titled by Moderator]
Original Title: Phone sim lock ( carrier lock)
iPhone XR
You purchased a used phone that someone hacked to be able to use any carrier. When you reset your phone, it removed the hack and set the phone back to the original carrier the phone was locked to.
As WheelieNick has said, only the carrier the phone is locked to can unlock it. Since you are not an active customer of them, they most likely won't unlock it.
The All Too Common SAD Reality of Buying a used phone - Apple Community
If it is sim locked you'll need to contact the carrier that it is locked to, that is the only thing you can do I am afraid
How do I remove SIM lock on iPhone XR?
