How to tell if an iphone 4s has a bad esn or imei?

I want to buy an iphone from the pawn shop or something like it and i want to be able to know if it has a good esn/imiei so i don't get ripped off.

As the person who is running the shop if you can get the ESN/IMEI from the phone. Then go somewhere to check the ESN/IMEI on a computer. If number is clear, go back and purchase the phone. If it is not clear, you may want to give the person a heads up that the phone has a bad ESN/IMEI number.

Run an imei check at iphoneox.com

One of the best sites out. Been using this site for every iphone i bought. http://swappa.com/esn

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