Google Fi (formerly known as Project Fi) is a mobile virtual network operator (MVNO), which means that instead of just using one of the "big four" carriers, it automatically jumps between several cellular networks depending on which has better service. Fi hops between Sprint, T-Mobile, and US Cellular, and also favors Wi-Fi whenever possible, including for calls and texts.
The main appeal of Google Fi is a simple pricing scheme that, depending on a person's usage habits, can end up being cheaper than any of the bigger carriers. It costs $20 for unlimited calling and texting, and $10 per gigabyte of data. Users get money back for whatever data they don't use, and data usage over 6 GB is free (though Google will throttle speeds after users hit 15 GB). It also has no roaming fees in more than 170 locations.
That changes Wednesday, with a few caveats.
Starting Wednesday, Google Fi will work with iPhones running iOS 11, as well as many new Samsung, LG, Moto and OnePlus phones running Android 7.0 or higher.
iPhone use, however, is still in "beta," which means users should be prepared for bugs, and won't be able to use certain features like visual voicemail and international tethering. iPhones also won't be able to make calls and texts over Wi-Fi.
Google first launched the service more than three years ago, and as part of Wednesday's announcement, it changed its name from "Project Fi" to "Google Fi," presumably signaling a commitment to keeping it alive. Google is notorious for killing or scaling back communications projects, including its Fiber internet service, Project Ara modular phones and its Allo chat app.
To try to boost sign-ups, Google is offering free travel gift cards for anyone who buys a new phone through Fi, or service credit for anyone who signs up with an existing phone. The deal will only be available on Wednesday.