I found the answer to my own question:
"A few words about compatibility in the U.S. TCL has two versions of the phone on deck for North America. The Canadian and V1 U.S. model supports LTE Bands 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 19, 20, 28, 29, 30 and TDD-LTE:38, 39, 40, 41.
The V2 U.S. model supports LTE Bands 1, 2, 3, 4, 5, 7, 12, 13, 20, 25, 26, 28, 29, 30; TDD-LTE 41; and CDMA 0, 1, and 10. Both versions will work on AT&T and T-Mobile, while
the latter will be better suited to Sprint and Verizon Wireless." (looks like Ummie4 was spot on)
This was found under
Hands On with the BlackBerry KEYone (Phone Scoop) I hope it is accurate - would enjoy the new phone with less hassle if I can use it with my current Sprint service.