How to connect carrier?
My xs max mobile one time reset and no connection sim valli activity so how to connect carrier lock
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You will need to contact your cellular provider to have them assist you with this matter. Without any additional details about your phone or what you have tried, so far yourself, to resolve this, there isn't much anyone here can do to help you with this issue.
Ref: How to unlock your iPhone for use with a different carrier - Apple Support