Is it safe to buy an iPhone that hasn't been fully paid yet?

So some guy I met wants to sell me an iPhone 5 for $200. The problem is that he hasn't finished paying the phone. He still has to pay $300 to T-Mobile and I was wondering, if I were to buy the phone, would T-Mobile make me finish paying it off? He said he's going to finish paying it off but if he doesn't & I end up buying the phone, will they tell me anything since he didn't finish paying it & it is now mine? Will I have to finish paying it off if he doesn't?

Dint go near it!

If he stops paying he may direct the supplier to you. Or he may claim its stolen

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