Google's Project Fi beefs up its cellular service with the addition of a third carrier partner
Project Fi stands out among MVNOs because it's able to intelligently connect to the best network available at any given time, while seamlessly jumping between them. If T-Mobile's signal cuts out for you, a Project Fi phone can keep your connection going by switching to a Sprint tower. Now with the addition of U.S. Cellular to the list of Project Fi's carrier networks, it's like your backup has a backup itself.
While U.S. Cellular is the smallest of the nation's big five carriers, adding it to Project Fi could still be a big win for Google, especially because the company's LTE network operates on lower-frequency 700MHz and 850MHz bands – these have the advantage over higher-frequency bands of penetrating further into buildings and dense urban areas.
Project Fi users will start getting access to U.S. Cellular's network over the course of the next several weeks. They shouldn't notice anything different on their end – except maybe even more reliable cellular signals.