https://thenextweb.com/insider/2018/11/28/project-fi-is-now-google-fi-as-it-adds-support-for-iphones-and-more-devices/

In the three years since its launch, Google’s Project Fi has one of the most reasonable phone plans out there, but it’s been tough to recommend because the service is compatible with so few phones. That’s changing today: the company is adding support for a whole lot more phones, including official iPhone compatibility for the first time. To prove its serious about this network enterprise, Project Fi is also getting a new, more official name: Google Fi.

As recap, Fi operates primarily on the T-Mobile and Sprint Networks, offers a truly sensible data plan in which you just pay for what you use, and has some clever techniques to switch between Wi-Fi and LTE to maximize your phone’s data performance. But all that is meaningless if the phones you want aren’t actually available.