Is it safe to give my iPhone IMEI and serial #s?

I sold my old iPhone 4 on ebay and some guy is asking for the Serial and IMEI
He has not paid for the item yet and I'm wondering if he can do anything malicious with this information that may prohibit the sale to himself or future buyers if he decides not to pay.

I don't know why he would need them, but I don't know of anything bad he could do with them… Maybe he's trying to check to make sure the phone isn't stolen before he pays for it. I'd ask him what he wants with it, since that's your phone's identity.

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