I installed my iphone SIM card into a stolen iphone, now my iphone does not work

My cousin found a phone, which it would obviously soon be reported stolen. I made the mistake of inserting my SIM card into it, took it out, and put it back in MY ORIGINAL iphone. Now, i can't make calls. I called customer support and they said my phone will not work because it is reported stolen. What can i do?

I do phone tutorials, and have one on this problem.
youtube.com/trollszrus

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