Ars Technica reports that lightning-quick 5G cell service will launch later this year, with the first 5G devices available in 2019. AT&T has been testing the new service, with better-than-expected results. They've gotten reliable speeds of more than a gigabit per second from millimeter wave frequencies, even in bad weather. And even non-line-of-sight connections have performed better than expected, with very low latencies, the company said. Currently, mobile devices use 4G LTE networks on frequencies below 1GHz, which are good for covering long distances and penetrating obstacles. The 5G networks will use millimeter wave signals of 30GHz and above, which were not thought to do well with building walls and getting through foliage. That means instead of seeing the occasional cell tower every few miles, there will be lots of small antennae beaming cell signals from poles, town halls, church steeples, and other structures. AT&T has been testing 5G in In South Bend, Indiana; Kalamazoo, Michigan; and Waco, Texas. Weather does not seem to be blocking the radio waves, which are traveling up to 900 feet away from the cell sites in line-of-sight conditions. That still means a lot of transmitters and antennae need to be hung around the country, if they are every 900 feet or so. In exchange so, users get 1.2Gbps speeds, compared to 15Mbps average speeds that OpenSignal say are the norm for 4G. It will be awhile before consumers can use those speeds, though, with T-Mobile planning to build out 5G mobile networks in just U.S. 30 cities this year, and Sprint not starting until 2019.