Are there any disadvantages of using an unlocked international phone on the t-mobile network? I would like to have my phone unlocked so that I can use it with a foreign SIM when I travel. The rest of the time, it will be used on the T-Mobile network. I'm finding it very difficult to get the phone unlocked, if not purchased directly from T-Mobile. I'm buying from Samsung to use the trade-in. Not sure what I should do. Order the Internat'l version or the T-Mobile version.