I'm currently in Europe. I just bought a new Galaxy A5 (2016) model SM-510F. I have been told this is a factory unlocked phone (I am brand new to smartphones - haven't even taken this one out of the box yet) and will work with any carrier in Europe. I want to use it here in Europe but also when I go to the US. Can anyone tell me how to unlock this phone for global use? I will be using TMobile in the US.