So I just bought an iPhone 5 from a friend and tried to activate it. He bought it from someone else and that someone used at&t. He then restored the phone and tried to activate it with a at&t sim(I think he used the same person's sim) but it didnt activate. I bought it from him for cheap($150) and that it was gonna be easy to unlock (unlock fusion and such). I haven't tried to unlock it yet, and I tried to activate it with the at&t sim. Gave me thesame message "This iPhone is not currently setup to work with carrier you're attempting to use. Please insert another SIM card from a supported carrier or request that this iPhone be unlocked". I then looked at the imei number and it starts with 99. I assumed that it's a sprint iPhone since verizon iPhones are already unlocked. I wanted to make sure so I chatted with a sprint support person and gave him the imei but he told me that the iPhone doesn't show up in their database, thus it's not a sprint iPhone. I then called verizon and at&t and they both told me the same thing. the iPhone is not in their databases. I finally called apple and asked if they can identify what carrier the iPhone is and one person told me it doesn't show what carrier. Then he told me since the phone has AppleCare+, he will direct me to someone who will help me unlock the iPhone. The next person was very rude and didn't let me tell her my situation. She said that apple doesn't unlock phones and that only carriers do. She asked what carrier I want to use it on and I told her Tmobile. She said go to Tmobile and they will unlock it. I just got back from there and they told me they don't unlock the iPhone and probably didn't understand my story. I would like some help guys I really don't know what to do. Thanks.