AT&T and Verizon both say they’re exclusively rolling out millimeter wave (mmWave) radios, which inherently provide far more bandwidth and capacity than today’s networks. But at 39GHz and 28GHz, those millimeter wave signals also don’t travel as far or penetrate buildings as easily as conventional cellular. That means you’ll probably drop down to LTE speeds when you transition indoors, and in order to cover the same area as today’s LTE cell towers, carriers will need to provide many more smaller cell sites. AT&T says it’s focusing on outdoor cells first, but is also looking at indoor ones for public venues like stadiums and concert halls.5G NR does have a solve for wider coverage, too: “sub-6” spectrum, meaning radio frequencies below 6GHz, which include everything from traditional Wi-Fi (2.4GHz, 5GHz) down to the decently building-penetrating 700MHz frequency that AT&T, T-Mobile, and Verizon use for a large portion of their LTE networks today. (T-Mobile recently added some 600MHz as well.)

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But AT&T and Verizon say they aren’t prioritizing sub-6 5G quite yet, partly because the carriers don’t have enough spectrum at lower frequencies to wow with speed. “With a 20MHz band of 600MHz [spectrum], you’re not going to get that lift. You’d have to ask yourself what’s different, what does 5G really mean,” says Verizon’s Palmer.It also might be partially because sub-6 smartphone chips may not be ready yet, at least for the particular spectrum pairings that US carriers currently use. “The FDD, which is what the bulk of operators have ... the silicon to support that FDD spectrum doesn’t become available until later in 2019,” says Gordon Mansfield, AT&T’s VP of converged access and device technology.

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Plus, both AT&T and Verizon expect current LTE networks to get faster as 5G rolls out — partly because people moving to 5G will free up room on the LTE networks, partly because of all the underlying infrastructure improvements the carriers are making to ensure their 5G networks will be faster, and partly because we still haven’t reached the limit of what LTE can do. AT&T even launched a fake 5G network called “5G Evolution” last year to show off how existing LTE Advanced and LTE Advanced Pro techniques could reach theoretical download speeds of 400Mbps. (Other carriers rolled out those techniques even earlier, though.)TL;DR: not all 5G will be equal, the faster flavor of 5G will come first but it’ll be spotty, and the rest of the time you’ll probably be surfing on LTE. But at least it could be faster LTE than you’re getting today.