Hi, I'm brand new to iphones, I just recently bought 3 used iphone 3 gs from sellers on Ebay. Each seller had 100% feedback and none were cell phone re-sellers (altho being a cell phone re-seller isn't a bad thing, I was just afraid I might end up with a bad phone) they all said the phones worked perfectly- my son and daughter checked them out and so far no problems. I doubt these phones were reported lost/stolen and the sellers had upgraded to a newer model so probably no issues with contracts not being fulfilled either. I want to use our iphones on Straight Talk which is a GSM carrier. So I have to unlock these phones. I found an unlocking service on Ebay that has 100% feedback that I plan on using. I just checked one of our phones IMEI numbers on an IMEI number checking site- it just told me all the info about the phone and said it was activated, does that mean it's ok? I would assume that if it was reported lost/stolen it would tell me that? Any advice is greatly appreciated since I am new to this, thanks in advance!