Are you using this in conjunction with a TalkTalk sim?
If so please see the pinned post at the top of the forum for details on how to access mobile support
https://community.talktalk.co.uk/t5/Mobile/Do-you-need-help-with-your-TalkTalk-Mobile-service/m-p/30...
If not there should be a way to lock your phone if turned on to be used by another person. Someone here may be able to help but the answer is probably in your Apple Account.
Thank you.
Please remember to mark Solved Posts with Best Answer. Doing so helps other customers and saves TalkTalk's Support Team time by only looking at unsolved topics. Thanks, Steve (a fellow customer).
