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. There’s bill protection, too, so if you go above 10GB (with 2 lines), they won’t charge you any more than $135. 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 (which is becoming more common, anyway), and it has to be a phone that gets its updates directly from Google: the Pixel 2, Pixel 2 XL, Moto X4 Android One edition, Pixel, Pixel XL, Nexus 6P, and Nexus 5X. That’s because traditional carriers do not include the network-switching software piece in the handsets they sell.
Here’s a referral code to get a $20 credit when you join Project Fi! Redeem it at https://g.co/fi/r/JFD22V