nexusGoogle today confirmed that it’s launching a new wireless network, called “Project Fi” — offering a simplified pricing structure, and using a “network of networks” to improve wireless coverage.

The company is partnering with T-Mobile and Sprint to launch the network in the U.S., but in a unique twist, Google will give users access to both the T-Mobile and Sprint networks, to improve overall coverage. “When you’re not on Wi-Fi, we move you between whichever of our partner networks is delivering the fastest speed, so you get 4G LTE in more places,” the company explains in a post outlining the new network.

Although Sprint and T-Mobile are both involved, T-Mobile CEO John Legere takes a competitive jab at Sprint in this blog post, saying, “Since the cellular connection will be made based on network speed, we expect to capture the largest share of traffic coming from Project Fi customers.”

Legere adds later, “It’s been fantastic to pull together some of the biggest brains in tech to drive innovation that could directly benefit tomorrow’s American wireless customers. The carriers have dug in their heels and held US wireless back for too long. This industry needs all the fresh blood and fresh thinking it can get.”

Google is also introduce a new pricing structure that will refund users for unused data. The official rundown:

Here’s how it works: for $20 a month you get all the basics (talk, text, Wi-Fi tethering, and international coverage in 120+ countries), and then it’s a flat $10 per GB for cellular data while in the U.S. and abroad. 1GB is $10/month, 2GB is $20/month, 3GB is $30/month, and so on. Since it’s hard to predict your data usage, you’ll get credit for the full value of your unused data. Let’s say you go with 3GB for $30 and only use 1.4GB one month. You’ll get $16 back, so you only pay for what you use,

What happens if you go over your allotted data in a given month? Google says in an FAQ: “Project Fi will first alert you if you’re getting close to your data budget. If you go over, you’ll still get full-speed data and data is charged at the same $10 per GB rate. For example, if you go over your data budget by 350MB, $3.50 will be added to your next bill.”

The service will launch on Motorola’s Nexus 6 phone.

Check out the full FAQ here. Here’s a Google video explaining Project Fi.

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