My Google Fu is still strong.... even if I use a duck
.
Appears as if Google Fi will switch between T-Mobile (Sprint... now part of T-Mobile), and one I've never heard of US Cellular (small & rural)... so really.... two. This was from a couple of years ago....
They've got to be "spoofing" the sim .... from what I know about tech. It sounds kinda gimmicky and more
PR than real coverage. If T-Mobile isn't viable in your area .... and it isn't everywhere, then good luck. If AT&T and Verizon join "that game" then it totally changes "the game" imo.
Mebbe they have.... but why would they?
Just "techie musings"... here
....