Need help buying used Android phone

[LuckyDogYachtS]

Hello,

I am trying to understand which phones will communicate at 4G speeds with t-mobile. I called T-Mobile. My rep says an AT&T EVO phone will only communicate at EDGE speeds because of the internal antenna??? I understand that only a 4G capable phone will communicate at 4G speeds, what I want to understand is which phones on Ebay or Craigslist will work on t-mobile at 4G speeds. Another friend says I can only buy a phone that has the t-moblie emblem to get 4G speeds??? Is there truly a different antenna inside the phone to communicate at different bandwidths?

Also I would like to understand unlocking vs jailbreak vs rooting?

Thanks you to anyone who is willing to help me as I move into the android market.

 

[EarlyMon]

The only Evo you can try on T-Mobile would be the unlocked European GSM Evo 3D, no idea if that will work with t-mo 4G.

The Evo in the US is a Sprint brand.

It's not the antenna, it's the radio chips themselves that aren't compatible.

Your safest bet is to shop for phone models that t-mo says works on their website.

In the used market, it sounds like people will tell you all sorts of things, even unknowledgeable t-mo reps.

 

[SUroot]

You need a phone that works with both 1700 and 2100 frequencies to get 3 or 4g on t-mobile usa. Plus 850 for gsm.


A gsm 3d will not support this I'm afraid. Most European handsets don't have 1700.