This is a baseless claim but there are so many propagators online. It’s even difficult to trace back everything to one original source because it has already been spread so much. One main justification for such a rumor is a photo of a technician up a signal tower, wearing a hazmat suit. People think he’s wearing the suit to protect himself against the airwaves, but he’s actually wearing it to protect himself from the harmful components of the cleaning chemicals he is using.
There are even plenty of statements from organizations like the International Commission on Non-Ionizing Radiation Protection (ICNIRP) and the World Health Organisation (WHO) that mobile communication airwaves are not harmful to your health.