Note that if you use a lot of data Google Fi can be shockingly more expensive than T-Mobile. I use ~30GB per month on T-Mobile (and, sometimes even more on Karm

Note that if you use a lot of data Google Fi can be shockingly more expensive than T-Mobile. I use ~30GB per month on T-Mobile (and, sometimes even more on Karma...I travel full-time, so I use my phone, a T-Mobile hotspot, and a Karma hotspot with the Neverstop plan for nearly all of my Internet usage) which would cost twice as much on Google Fi as on T-Mobile. I was very excited about Google Fi, until I actually did the math.