I would do some searching and double check. When I was originally trying to jailbreak/unlock my phone (before I gave in to the dark side that is AT&T) it was a requisite that you did not use anything higher than 7.3.2 I think. At any rate, check these forums and the other infinite amount of info on unlocked iPhones. I assume it will all relate to the method that was used to unlock your phone. With all of the quasi-bricking going on, I would hate to see you lose your phone.