5.8Ghz and 10.6GHz bands are used terrestrially. (WiFi and LOS Fixed Wireless).
5.8GHz outdoors is really just Line of Sight. 10.2GHz to 10.6GHz band gives smaller aerial panel arrays and blocked easily by one tree.
Both only good for roof top or wall fixed aerials.
Above 10GHz to 400GHz you are looking at HAP, Satellite and Point to point Line of Site.
5G doesn't exist. If it does it will be about more flexible infrastructure, not faster or higher frequency mobile.
3.5GHz band has been tried for Mobile and Nomadic, it's rubbish compared to 1.8GHz. Propagation too poor except for fixed wireless.
Mobile has various bands from 700MHz to 2.6GHz, Operators and Countries use spectrum poorly. There are good arguments that Mobile should be only 880MHz to 2.2GHz (with gaps for DECT and GPS) and a single wholesale infrastructure for best utilisation/spectrum efficiency.
Regulators want to sell as much spectrum to as many Mobile operators as possible to maximise Licence Revenue. A truly stupid way to assign & manage spectrum