I know they complicated things with the different bands etc. but that's not Apple's fault. I will be buying an unlocked iPhone 5 once they come out in a few weeks. I'm currently using Straight Talk (AT&T MVNO) which is a GSM carrier. The plan was to buy an unlocked GSM iPhone 5 and then stick in a Straight Talk nano-sim. LTE may or may not work initially but that's not the question I'm asking. I go back home to Croatia and would like for my iPhone 5 purchased here to work on LTE over there. Will this work with the unlocked GSM iPhone 5 purchased in the US? Thanks!