The radiation from the tower is too diffused, radiation from cellphones is concentrated and much closer to you. It's like the moon and the sun thing, the moon being much closer to earth even though its much much smaller than sun has more influence on earth's tides than the sun.

LOL that's not what "chances of getting cancer means". Its a probability factor. The probability of getting cancer is 3 in 100,000 in normal conditions, and in radiation exposed environments you're more likely to get cancer, that is the probability is 9 in 100,000.