Updated for 2019: How to Use Your iPhone with Project Fi. Google’s Project Fi works by connecting the cellphone user to Sprint, T-Mobile, or U.S. Cellular, depending on which has the strongest signal at the time they want to make a call. It is this versatility which has driven so many tech junkies to Project Fi as it eliminates the need for committing oneself to a single network for an extended period of time.
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