T-Mobile widened the gap between itself and Sprint, Verizon, and AT&T in terms of value for cost, according to Business Insider Intelligence's upcoming 2018 Digital Telecom Consumer Survey. The wireless carrier led by CEO John Legere won for the second consecutive year thanks in large part to its streamlined plans and additional perks for customers. T-Mobile subscribers are also the most loyal among the Big Four wireless carriers. The following is an excerpt from Business Insider Intelligence's forthcoming 2018 Digital Telecom Consumer Survey.