How would you deal with a roommate that steals?

Exactly one week ago, my roommate stole my phone(iphone 5). I know it was him for sure so i'm not gonna go into detail about that. I didn't know the roommate before i moved into my apartment(it was a random pairing). I still have to live with him for another 6 months before our lease runs out. I can't prove he did it so I can't go to the police and I already tried locating it. What should I do in terms of dealing with my roommate?

Put a hidden camera in your bedroom and hopefully you'll catch him in the act and then you'll have enough evidence for the police

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