The California Public Utilities Commission's Fourth Round of mobile testing begins today. Along with the same 1,200 points we have tested in the first three rounds, we are adding 790 additional test points in urban areas and in problem areas where local citizens are challenging mobile broadband speeds on the California Interactive Broadband Map. In the last round, Verizon made huge strides in rural and tribal areas bringing broadband service of six Mbps down and 1.5 Mbps up to many areas of the state that were previously unserved. Will Verizon continue to make strides and continue to dominate mobile broadband service? Will the other providers, AT&T, Sprint and T-Mobile make improvements to their network? Stay Tuned as Chapter Four of the California Mobile Broadband Speed Test unfolds.