Google Fi 5G on iPhone. Finally. 
Discussion
Still based on T-Mobile network?
I believe so
Still some people using the same basic trash?
Google Fi is still the best plan for people who travel internationally, don’t want to change SIM cards, and don’t want to be charged an arm and a leg. Works well enough for me.
Gotta say... Did a 30k mile road trip around the US from coast to coast and Fi did a great job of keeping me connected. One network just wouldn't cut it. The roaming worked really well.
😳💯