Google does say that the "full Google Fi experience" might not be available to any ol' phone you bring over and is instead reserved for phones "designed for Fi", like the ones they sell. With a simple service model charging $20 for a dial tone, unlimited texts, and then $10/GB after, the no-strings attached plan gained a niche status, especially since data and messages cost the same throughout most of the world.
Not all phones are 100% compatible with Fi, so using an iPhone wont get you the quick Wi-Fi/LTE enhanced transition that is compatible with only devices on Android Pie.
IPhone users can sign up for Project Fi with the new Google Fi for iOS app, which is now in beta.
To celebrate the rebranding, for today only (11/28), Google has a few Fi deals going on.
Google's cellular service gets rebranded, offers support for iPhones
Google's Project Fi wireless service, one of the most capable phone plans around, just got a huge facelift.
More info can be found in Google's new post on the Project Fi blog, and on the Project Fi website. No matter what phone you use with Fi, you'll get great Fi features-like reliable coverage, easy group plans, and high speed global data coverage for the same rates you pay at home.
Finally, Google is giving away some goodies to anyone who buys a phone from Fi (with service). What you won't get, unfortunately, is the ability to switch back and forth between multiple networks, automatic connections to public Wi-Fi, Wi-Fi calling, and access to Google Fi's VPN service. You can go here to see if your phone is compatible with Google Fi and which features may or may not be missing.
However, starting today, "Project Fi" is expanding beyond phones like the Pixel 3 and the Pixel 3 XL, including launching on Apple's iPhone, Samsung phones, OnePlus, LG, and Moto handsets, according to Google. Fi owners are entitled to free data-only SIMs to use in any device they please. First, it combines cellular and WiFi so that you may be making calls or receiving text messages over WiFi, but the service will seamlessly transition to cellular when you leave a hotspot. That will net you $999 worth of gift cards, which you can mix-and-match for services like Hotels.com, Airbnb, or flights from Delta or Southwest Airlines.More news: UNC reportedly hiring back Mack Brown