What is Google-Fi

At the highest level, Google Fi is a phone carrier operated by Google.

It works by giving you mobile data service on three mobile networks (T-Mobile, Sprint and U.S. Cellular), which your phone will intelligently switch between — it also uses Wi-Fi to make calls and send texts whenever available.

It's all about simplified billing with no hidden fees or overages.

Google Fi works with a special SIM card — and a little software on your phone — that can authenticate you on T-Mobile, Sprint and US Cellular, and switch between them on the fly based on a variety of factors.

On the Pixel 3, 3 XL, 2 and 2XL, an integrated eSIM lets you use Google Fi without a physical SIM card — it also frees up your SIM slot to be used for another carrier's network when you need it.

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