5G Radio waves

Radio waves, or electro magnetic waves, are used for many things including TV- and radio broadcasting, GPS, baby alarms, bluetooth and mobile communication.

The current 5G rollout in the US is using a pre-stage version of the final 5G standard with frequencies in the 28GHz band.
In countries like Denmark, the first implementation will use 3,5GHz which is in the middle of the current Wi-Fi frequencies.

Have a look at this post for more information.