What makes Google Fi unique is that Google licenses service from multiple cellular companies and bundles them together-specifically, using Google Fi in the US means your device will combine the T-Mobile, Sprint, and US Cellular networks and will jump among them as needed. Any unused data is rolled over at the end of the month and Google lets you pause you service whenever you want so you're never locked into any contract.
After more than three years, Google is finally expanding "Project Fi" in a major way. Google says that's because only the phones listed on the site have the hardware and software required for these features.
Today's wider compatibility announcement isn't really fixing this problem.
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The rebrand is easy-Project Fi is losing its "Project" designation and is now just "Google Fi". And visual voicemail won't work; instead, Google will send you a transcript of each voicemail via text messaging.
In celebration of all of these changes, Google Fi is offering a mix of gift cards from Airbnb, Delta Air Lines, Hotels.com, and Southwest Airlines. Non-Fi devices will get regular-old T-Mobile MVNO service, without Fi's carrier switching or the recently announced VPN encryption. 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. Fi owners are entitled to free data-only SIMs to use in any device they please. But you'll also be getting coverage that is inferior to what a true Fi device gets.
Speaking of which, Google is ringing in the Fi relaunch with two travel-themed promotions, both of which run for today only.
"Most Android phones and iPhones work with Google Fi", Google notes of the most important new feature. For those who bring their own phone to the carrier on November 28th, a $200 service credit is available.