I must have been unclear perhaps - and to clarify:
I know that T-Mobile supports Band 12 (which is 700Mhz) and my current h/w uses Band 12 and it works very well.
My disappointment is/was derived from the fact that it appears that the final hardware for LIbrem is the gemalto PLS8 - and when I looked that up, the US version says it supports only:
LTE (17,5,4,2); 3G (5,4,2); 2G Quad Band
And I interpreted that as no Band 12 on PLS8 - thus no Band 12 on Librem 5 (unless I get my own baseband radio to put in it).
Does that make sense?
[FYI I started another topic on this to start a new conversation with current info here: How to Use Librem 5 with T-Mobile?