The cell phone carriers with the highest coverage ratings as of 2015 include Verizon, T-Mobile and AT&T, according to Top Ten Reviews. All three carriers feature at least a 75 percent rating on the urban coverage score, with Verizon topping the list at 100 percent.
Among the three top-rated carriers, T-Mobile has the lowest rating for rural coverage, with 50 percent, while Verizon and AT&T are rated at 95 percent and 85 percent, respectively. In terms of 4G LTE coverage, AT&T has the lead with 620 markets covered. However, that lead is not concrete because most carriers define markets differently, which results in inconsistent ratings.