How to make sure an IPhone I bought online is good

I just recently bought an IPhone 4 for sprint through someone on Craigslist. It was too late at the time to go to a sprint store to check it. I already called and they told me the phone has not been reported lost or stolen. I guess what I'm trying to ask is would I have any other problems? Such as SIM cards or activation?

There's no way you would know that what you got is legit or good. Just hope you have a good return option.

A sprint phone doesn't have a sim card since it's CMDA network and not a GSM.you'll most likely have to have the phone added to your service to really check it out thoroughly. You can however, connect to a Wi-Fi network and check out the internet functions of the phone without service… I buy a lot of things online and they are mostly good.

I purchased a phone from http://danideals.com and never had any problems

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