What information do I need to check if a verizon iPhone 4 has a clean esn?

I'm thinking about buying a sprint iPhone 4 from craigslist, and I was wondering what information I would need on the phone to call up sprint and have them check whether or not it has a clean esn, or how I would go about finding out before I buy it.

Get the person who is selling the device to send you the Serial number/ MEID number. You can find this by going to Settings>General>About>. Get the person to send you the serial number and the MEID number ( or a screenshot of the about page). Call Sprint and tell them you are buying a phone off Craisglist and you want to make sure the phone's clean.

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