Google just announced onstage at its event in Mountain View that the two newest phones — the Nexus 5X and the Nexus 6P — will be compatible with Project Fi, the company's own mobile network. These will be the first phones outside of the Nexus 6 that work with Project Fi when they go on sale in October.

Project Fi works by combining Wi-Fi calling with a cellular network connection (Fi is compatible with and can alternate between Sprint and T-Mobile). The phone always picks the fastest available network from one of three sources all while simplifying the payment structure of your cell phone bill. For $20 per month, users get the same things they've come to expect from any carrier, like talk, text, Wi-Fi tethering, and international coverage, along with a flat cost of $10 per GB per month for cellular data (both in the U.S. and abroad). Users also get credited for any unused data during each month.

We tried Fi earlier this year and really liked it, even if it is a bit of a nightmare if you're an existing Google Voice user. In fact, one of the only downsides to Fi so far has been that it was limited only to the Nexus 6.

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