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Which of these features are supported by "Compatible with Fi" phones is different depending on the device. iPhones, for example, don't get Wi-Fi calling nor visual voicemail, and can't connect to hotspots outside the US. Previously known as Project Fi, the service is now officially available on iPhones as well as the majority of Android phones.

Google Fi costs $20 per line for unlimited calls and texts (and $15 for each additional person on your plan), and then it's $10 per every 1GB of data used.

First, according to Google's compatibility tool, only iPhones newer than the iPhone 5C will work with Fi. Google spoiled this a bit by sending out "Google Fi" flyers (complete with the new logo) with some Pixel 3 purchases earlier this month, but now it's official.

If you're a new customer, you have to port in your current personal phone number during sign up which must be now active.

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If you're familiar with Fi, you know that it uses multiple networks and Wi-Fi as part of its plan. Google doesn't operate its own cell tower infrastructure for Fi, but instead rents it from other operators, including T-Mobile and Verizon. And unlike phones made for the service, automatic network switching between Sprint, T-Mobile, and US Cellular won't be active and phones will stay on a single network, which in the past has been T-Mobile.

The draw of Project, er, Google Fi includes features like global data in 170 countries at no extra cost, spam protection, data-only SIM cards for extra devices, and that sweet ability to switch between multiple cell carriers so-in theory-you're always getting the speediest network at a given time. And effectively having access to 15GB of data for $60 is pretty handy if you're an worldwide traveller. However, you won't get full Google Fi experience on all these devices.

The report says "Fi-friendly" phones will "offer the best overall user experience for subscribers", without going into detail on what that means, exactly. Since its inception, Fi has only been compatible with specific phones, all of which ran Android. And if you bring over your own device, you can get up to $200 in Fi service credit.

Regardless of what phone you want to buy from Google Fi, you can receive free travel gift cards matching its price (up to $999).