Note that I'm not presenting the above link as absolute proof but merely as something that causes one to think about it. It is not 100% clear cellphones are safe. Maybe 99.999999%, but not 100%.
Nothing can ever be proven to be 100% safe, and caring about the difference between 100 - 0.00001 and 100 - epsilon is completely ridiculous.
Note that I'm not presenting the above link as absolute proof but merely as something that causes one to think about it. It is not 100% clear cellphones are safe. Maybe 99.999999%, but not 100%.