Project Fi is ditching the invite system. 10 months after Google unveiled its own mobile network, which lets consumers pay only for the amount of data they use each month, the company is opening access to everyone inside the United States.

"With Project Fi, we deliver fast wireless service with the flexibility to use it where you want (even internationally) and a monthly bill that’s simple and easy to understand," wrote Simon Arscott, Fi's product manager, in a blog post. "Today, we’re excited to be exiting our invitation-only mode and opening up Project Fi so that people across the U.S. can now sign up for service without having to wait in-line for an invite."

For the next month, Google is discounting the Nexus 5X down to $199 as an inexpensive way to get started with Fi, which only works with Nexus smartphones. Project Fi connects to the cellular networks of both T-Mobile and Sprint, switching between the two to offer customers the best possible coverage. Google is also pushing Wi-Fi and public hotspots in a big way with Fi; over 50 percent of current customers connect to public hotspots using Fi's "Wi-Fi Assistant" on a weekly basis. As for cellular data, Google's Project Fi subscribers are impressively lean in their usage, averaging 1.6GB of data each month.

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