Has anyone brought an Iphone 5 to straight talk?

At straight talk they say it is not possible and that you have to buy it from them but for some reason I don't believe it, is anyone out there using an iphone 5 on straight talk that didn't buy it from them? How did you do it?

All the iPhone 5 are GSM capable which means the phone can take a nano-SIM. All you need to do is unlock the iPhone 5 and get a StraightTalk nano-SIM or trim a micro-SIM and you're all set. You can check online for factory unlocking iPhone 5. I can also suggest you some solutions.