According to Tmobile, in theory it should work on 2G and 3G.
A very skilled tech who I have gone to could not solve it.
We put in 2 sims, booted it from windows and android, and then resorted to wiping the machine with a hard reset.
The machine would still nor read the card.
if it read the card it would say no signal.
What bothers me the most is no company tech support.
They want ME to send it back on MY nickle.
The whole thing is very tiresome and unprofessional.
Besides that, I REALLY like the machine.
It is just not what I paid for as I wanted to use it on the road….