Protagonists often argue along the lines - we have been exposed for years to
electromagnet radiation from many other sources (TV radio etc.) without any
proven ill health problems. But brain tumours are becoming more common - the UK Brain Tumour Society says that their incidence has increased by 45% over the last 30 years.

Radiation-related illnesses tend to show themselves about 10 to 15 years
after low level nuclear radiation exposure. High power TV transmissions
became widespread in the UK from 1955. Does this add up ?

Because doctors have not yet established what causes primary tumours (ones that originate in the brain), they cannot identify specific risk factors.
When people who have used a mobile phone over prolonged periods for years it is just put down as a coincidence. The last such case I know of, a phone company worker, was reported by a Northallerton brain surgeon January 2001. How many 'coincidences' can be ignored?