Google Fi, the mobile virtual network operated by the search giant, added a third carrier to its roster - U.S. Cellular (the other two being Sprint and T-Mobile). U.S. Cellular offers 4G LTE in 23 states in both urban and rural environments. The carrier specializes in finding areas where its competitors have spotty coverage and building towers there - it's the Obi-Wan of people who can't get good reception with the major carriers (not uncommon in rural areas). This is a boon for Google Fi users because Fi phones pick the best network for your current location. They can be connected...
Source: http://www.gsmarena.com/google_fi_adds_support_for_the_us_cellular_network-news-18721.php
