Is there any risk in buying an unlocked iPhone?

I'm out of contract with AT&T, with a 3Gs. My son tells me I should buy an unlocked 4s from a private party to preserve my unlimited data plan. Aside from taking the usual precautions for a high dollar private transaction, are there other concerns? If I walked into an Apple store with a question about using the phone, could they tell its status, and if so what could they do to me? Also, is unlocking a phone the same as jail-breaking it?

Sometimes when people go out and buy second hand phones, they have to make sure not to take the risk of the phone being locked otherwise it won't work. I would just buy a new one off the bat, to avoid any possible risks.

I know a jail-breaked phone void the warranty. So if the phone still in it's warranty period, the warranty would be useless.

Other than that, it is really a personal choice, but the phone might be more susceptible to viruses and trojan horses

Yes! Never buy a used phone because you have to deal with risk of people who used it last

My iPhone is unlocked version. It has nothing to do with jb. So i'm ok with it.

No risk

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