I saw some iphones on criaglists...is their any way to find out, the seller is selling his or her personal or friends phone but not the stolen phones ?? like by checking their IEMI number, some thing like that ?
You'd have to get the IMEI and call it in to AT&T and they can tell you whether it is clean or not. Or, you could just put your sim card in it and try to make a call. My understanding of a lost/stolen IMEI is that it won't make calls in or out.
I actually just got off the phone with AT&T asking the same question.
I asked if there was a way they could find out if an iPhone was stolen or not and they said no. BUT if you give them your IMEI number they can check any accounts the iPhone was previously registered too and check if those accounts have reports of a stolen iPhone.
To check the IMEI number:
Settings>General>About>IMEI:XXXXXXXXXXX
Technically they can't even tell you if it was reported stolen, only if it has been used on another account or not. Telling you that it was reported stolen would be giving you info from an account that you don't have access to, which is a big no-no (not to say that many reps probably won't do it anyway).