I’ve been a Project Fi customer for over 2 years. We went from a Verizon bill of $140+ per month for 2 phones with 800 minutes, 100 texts, and unlimited data to Project Fi with unlimited talk and text and $10/GB on data, with an average bill of $50-55/mo. If you’re always on Wi-Fi, it’s a no-brainer.
Project Fi uses towers from Sprint, TMobile, and US Cellular, switching when the signal from the current carrier gets low. Also, Wi-Fi calling and texting works flawlessly – I’ve even taken calls over satellite Internet.
The only caveat with Project Fi is that you pay for your phone up front, and it has to be a phone that gets its updates directly from Google: the Pixel 2, Pixel 2 XL, Moto X4, Pixel, Pixel XL, Nexus 6P, and Nexus 5X.
Here’s a referral code to get a $20 credit when you join Project Fi! Redeem it at https://g.co/fi/r/JFD22V