The new cell network uses high band radio frequency millimeter waves to deliver high bandwidth data to any device within line of sight.
"Today's cellular and Wi-Fi networks rely on microwaves – a type of electromagnetic radiation utilizing frequencies up to 6 gigahertz (GHz) in order to wirelessly transmit voice or data. However, 5G applications will require unlocking of new spectrum bands in higher frequency ranges above 6 GHz to 100 GHz and beyond, utilizing submillimeter and millimeter waves – to allow ultra-high rates of data to be transmitted in the same amount of time as compared with previous deployments of microwave radiation." [Source]
"One of the ways 5G will enable this is by tapping into new, unused bands at the top of the radio spectrum. These high bands are known as millimeter waves (mmwaves), and have been recently been opened up by regulators for licensing. They've largely been untouched by the public, since the equipment required to use them effectively has typically been expensive and inaccessible." [Source]