How to shut down phone if stolen
Phone was stolen how to know if it was being used
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Hi Kimiboo82,
Welcome to the Apple Community, where some of us do our best to help each other.
Sorry to hear you phone was stolen.
Apple Support have an article online to help you:
If your iPhone, iPad, or iPod touch is lost or stolen:
https://support.apple.com/en-us/HT201472
There is a link in the article (step 5) to how to "Erase your device" remotely.
Hope this helps you :)