All these carriers below are supported:
All of them are Prepaid iPhones available on Walmart, BestBuy, Target etc.
Success if 99% if the device was sold by Reseller Company not by Tracfone itself.
GSX Sample Policy of supported device:
Initial Activation Policy Description: 4000 - US Reseller Flex Policy ()
Applied Activation Policy Description: 2360 - US TracFone / StraightTalk Locked Policy