Ding, Ding, Ding @:-) This ^ - spot on, 3G/2G is all one need or will be using with global data roaming under T-Mo's plan - and I know last month, we had better than 2G data in most of Korea & Taiwan traveling under those plans.

Generally speaking, smartphones sold/targeted for the North America markets aren't always compatible with the rest of the world / global use while traveling - forcing some compromises. And, that is - up until very recently, usually involved popping out & in different sim cards, sometimes using the adapters - switching devices & remembering the APN settings, etc. T-Mo made it a lot easier & simplier, haven't touch that micro-Sim slot in almost 2 years since switching ... just power on & viola, service with the "Welcome to - - - - - - " MSG.

Even here in the US, there are still spots with less than optimal coverage - sometimes, mine will switch/show the "H" symbol instead of LTE, but - data is still fast, in fast - very fast, so I'm not worried; and, working out of the home office & a few other places with Fios coverage, that's just as nice if not better with turbo speed & low latency connection.

Perhaps that VZW unlocked Samsung is more than adequate to handle T-Mo's global data roaming - pop in the new Sim & just go enjoy the vacation/trip.

** On a related note, just saw that Nexus 6 (XT1103) 32GB model is on sale on the "Bay" for $300 shipped, 1 year warranty - factory unlocked ... not a bad deal at all.