Part of the appeal of Google Fi for me is the unlimited free international roaming. Do you know if there's any competition in that area?
Whatever you do, don't give one of those sim cards to my kids, which somehow manage to burn multiple GB a month each with the occasional music/youtube video in the car/whatever when they are away from the home/school/etc wifi.
Last night on the way to some mall we took a route though some sort of jungle dairy farm. Both of the locals had no signal when about half way through traffic stopped ( except for the masses of motor bikes, they just keep comming ). I was the only one able to pull it Google maps and check how far up thr road the traffic was.
Maybe Mumbai is set up better for Fi? What parts were you in ?
Also. The main post here should be about Google payments, not Fi.