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.
Can you explain what you think "radiation" means? This is radio -- electromagnetic waves. It doesn't have a scary source like a nuclear weapon, but the energy does indeed radiate from the antenna.