AT&T’s 4G LTE network was dubbed the fastest in the nation in a third-party speed test that was conducted across thirteen locations within the United States. The tests, conducted by PCWorld, found that AT&T offered the fastest 4G LTE data speeds (9.56Mbps) when it came to measuring download throughput, but that Verizon’s 4G LTE network offered the fastest upload speeds on average (5.86MBps). To Verizon’s credit, too, it does offer a larger 4G LTE footprint and, since its network has been around longer, it’s possible that its network is more saturated with users than AT&T’s is.
T-Mobile offered the fastest 3G network when it came to both download and upload throughput speeds. The carrier offered an average download speed of 3.84Mbps and an average upload speed of 1.44Mbps.
PCWorld conducted its tests in Atlanta, Boston, Chicago, Dallas, Denver, Las Vegas, Los Angeles, New Orleans, New York, San Francisco, San Jose, Seattle and Washington, D.C but noted that AT&T’s 4G LTE network isn’t available in three of those cities and so it conducted AT&T’s tests in just 10 locations.