From Wikipedia: “In the U.S., Verizon is using 28 GHz and AT&T is using 39 GHz. 5G can use frequencies of up to 300 GHz”[1]. That is high frequency relative to the frequencies of 4G, and WiFI or Bluetooth which are around 2-4 GHz.[2]

Not sure what definition of radiation you’re using, but yes, electromagnetic waves are radiation.

[1] https://en.wikipedia.org/wiki/5G [2] https://en.wikipedia.org/wiki/Wi-Fi