Earlier this month, Google announced that Project Fi would soon add its third partner, US Cellular. Today, the new service should be active for all Project Fi users.
When Google announced the new addition to the Project Fi family, the firm noted that Fi users have a cellular signal 99% of the time, and 95% of the time it's a 4G LTE signal. This was before the addition of US Cellular.
Project Fi automatically chooses the best network for you based on where you are. Prior to the addition of US Cellular, it would choose between Sprint or T-Mobile's network, or Wi-Fi. While the above coverage map might not look like much, there may be areas where US Cellular just gets a better signal than the other two partners.
To make sure that everything is working properly, you'll need to update your Project Fi app, which you can grab right here. You can also check out our review of the service if you're thinking of signing up.