AT&T's wireless network has become the fastest in the nation, according to Speedtest.Roberto Machado Noa/LightRocket via Getty Images)Maybe it really is evolving? AT&T's wireless network was named the fastest in the US, it announced Wednesday, based on an analysis of speeds over the first quarter of 2019 by Ookla's Speedtest. It noted that AT&T's speeds improved by more than 15% during that period, while the other carriers plateaued. AT&T's speeds jumped from 34.3 megabytes per second (MBPS) to 40.7 MBPS, according to the data it presented. By comparison, T-Mobile hit 35.4 MBPS, Sprint reached 34.9 MBPS and Verizon was at 33.3 MBPS. Keep in mind that different tests have yielded different results. Last month, OpenSignal, another firm that tests wireless speeds, said it found that AT&T's\u00a0controversial\u00a0 5G E (short for 5G Evolution)\u00a0clocked in slower\u00a0than services from Verizon and T-Mobile. However, AT&T dismissed Opensignal's method as flawed. Now playing: Watch this: AT&T tries tricking customers with 5G E logo 1:58 In its announcement\u00a0 Wednesday, AT&T highlighted its 5G E service -- which is really just fancy branding for its advanced 4G LTE network -- as a major factor in its speed growth, saying it laid the foundation for the upgrade to 5G next-generation cellular technology. "We are thrilled Ookla has confirmed that we are the fastest wireless network nationwide," said Andre Fuetsch, president of AT&T Labs and chief technology officer. "This is further proof that our wireless network strategy and build are benefiting our customers in ways that other carriers cannot match." Responding to results from Speedtest, Verizon asserted that its wireless network is the fastest and most reliable. "The evidence is overwhelming that the Verizon wireless network is best, fastest and most reliable," said Howie Waterman, its media relations boss, in an emailed statement. "We focus on deploying the best technologies for our customers, at scale." Neither T-Mobile nor Sprint immediately responded to requests for comment. In 2018 and 2017, Ookla named T-Mobile as the fastest carrier. Originally published April 3, 6:30 a.m. PT.Update, 9:47 a.m. PT: Adds comment from Verizon.