Risks of buying used iphone 4s?

Is there anything that could go wrong if i buy a used iphone from someone i don't know? I'm gonna trade my ipod and my HTC vs one iphone but i'm not sure if its safe so if anyone could help me on this id be grateful

Battery life internals could be damaged. I wouldn't do it

I wouldnt buy anything like that 2ndH. Thats why the resale value is low. Because there are so many problems. People sell them when there's something wrong only they won't tell you.

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