I purchased an iPhone 5 in January of 2013 off of ebay. It was "factory unlocked" running 6.1.2 and updated to 6.1.3 running flawlessly. Anyway, I was using it on straight talk for the past 6/7 months with 4g working and everything even mms. It was not jailbroken or anything. So Last week I was on itunes and it updated to 6.1.4 and all of a sudden when i go to turn it on it's locked asking for activation. Not only that but it's locked to SPRINT! How is this possible? When it was "factory unlocked" I checked the about me on the iphone and I could have sworn it said att as the carrier. WTF. And now there's no way to unlock my phone. I researched and every where it said its impossible to use att/tmobile/straight talk on the sprint iphone. So how the F* was It unlocked before running 4g on straight talk? I need my phone factory unlocked to work in the us With straight talk again, like before. I'm beginning to think it may have updated with the wrong software or something. Now I'm f**ked. And not only that but the resale price just went down since its now sprint. So how the f is this possible and how do I fix it?
Added (1). I already bought the gpp sim and it doesn't work at all. I'm so confused, I could have sworn it wasn't sprint before.
Added (2). To be more specific I purchased it used in mint condition on January 2, 2013