When you extract temporal and frontal lobe glioblastoma from the rest of brain tumor numbers you get a graph like this:

https://microwavenews.com/sites/default/files/de-vocht-respo...

Not saying it's a direct correlation, this is a very difficult topic to analyze, but if you are a heavy phone user you take your chances. Cancer has a long latency period, so you may die of other causes before the damage is realized.

Personally I think other more immediate non-thermal effects of pulsed RF are of more concern than cancer at the moment. This may change, but that's what the current research seems to point towards.