I lost my iPhone to a scam, what should I do?

My iPhone 5 screen was smashed so I decided to get it repaired, I saw some guy fixin them on facebook, it seemed legit at the time so I contacted him and he said he would be happy to fix it but it would take a day, so I agreed and met up with him in the towncenter and gave him my phone, but as soon as I got home he had delete his facebook amd all his messages, and he didn't tell me where to collect the phone from. So what should I do? And please don't tell me how stupid I'm because I realise that.

Report the theft to the police.

You call the police. Give a description of the person, where you met There are probably security cameras around somewhere
And real phone repair people don't advertise on Facebook and don't meet you on the street. They have an actual store where you go and drop off your phone and get a receipt

Activate lost mode on find my iphone to make sure he can't use it. Be sure to call your carrier and report it lost also.