O.K. I think I'm getting confused with all this band stuff. There's more than one type with the same frequency? It looked like all I needed was something with 850MHz to work, but it seems I was wrong/confused.
I'm going to try to get a bit more specific, much appreciated if you're willing to help me more.
I want the phone to work correctly with T-Mobile in the USA (no contract, cheap, easy to get, can swap sim/carrier anytime, can jump on with friends/family who all have it), as well as South American countries using Claro (apparently largest/best option and also sim based). Time in the USA will be relatively short (few months), South America will be 2-5 years (kind of unknown really, could be longer)...and I need the phone to reliably make calls most anywhere. Data isn't critical, and may not even be available most of the time, so many things need to be downloaded on an SD card for offline use. If I can get data and it's not terribly expensive, it'll probably be useful where available...otherwise WiFi to get necessary data.
I really don't know what 2G, 3G, 4G, LTE, EDGE, GSM, CDMA, UMTS, HSPA, GPRS etc etc...all that crap means. No idea what I need to get good reliable coverage, in the US or South America.
Doing some searches on the international version of the S5 (G900F) I found some T-Mobile info that suggests the phone only works on 2G (roaming?) in the US and that it's a bad thing. I searched for T-Mobile spectrum and got this:
http://en.wikipedia.org/wiki/T-Mobile_US
Looks like T-Mobile only works with Band 2, 4, and 6 and somehow the bands work as multiple things. The S5 G900F though says it works on 4G / LTE band 2...so shouldn't that mean that it would work on 4G and LTE on T-Mobile here?
My research on Claro suggested I needed GSM 850MHz. Acording to the G900F specs I found it says it supports 4G / LTE Band 5, which appears to be the 850Mhz spectrum I need (based on that T-Mobile wiki page). But it's not GSM. Or something?
Like I said, I'm confused. I see 850MHz listed as Quad Band, GSM, UMTS, and 4G /LTE all at the same time in some places, without band numbers. What does that mean?
I guess I need to find more info on Claro, and I have the website, but it's all in Spanish. I'm having a hard time with this band/spectrum stuff already...and not getting solid info on the most used/available frequencies that Claro uses (other than the 850Mhz I got). I think Ecuador is going to be "home base", so working there the best/most would be good.
I have found lists like this:
http://www.gsma.com/latinamerica/gsma-la-operators
But it's a list only for GSM(A?)...not all the other stuff. So I have no idea how complete that info is, or what frequencies of the other stuff they support. So I still have no idea what version of which phone I want/need. I think I need to understand all this spectrum crap first, and could use help putting together a proper list of the specific frequency, band, spectrum, and/or types I actually need to look for in both countries.
Again, very much appreciated if you can help me sort this out.