Barefoot is right, it's an inverse square law. Twice as far is 1/4 the power, three times is 9, four times is 1/16, 5 times is 1/25 and so on.
A phone is typically 5cm metres from your brain, so a mast 100 metres away would have to be more than four million times as powerful to cause the same effect.
I say "more than" because buildings etc make it drop off faster than that.
Obviously it isn't quite the same frequency as for wireless computers, else they'd interfere with each other big time, but it is not that far off either.
If you want to understand why I think the arts dominated "education" system in this country is so crap, the ubiquitous misunderstanding of "radiation" is a good key.
Nearly everyone has radiators in their home. They work off radiation, the same sort as for mobile phones, and amongst the most dangerous forms of radiation from nuclear plants are electromagnetic radiation.
When I say the "same", of course some is like dropping a pea onto concrete, and some is like dropping a rock the size of Texas. The nasty EM radiation from nuclear plants is trivial to contain thankfully.
But it is the same stuff. Some radiation is more solid(ish) particles, but you don't get them from mobile phones.
Mobile phone are so common that if there were a major health effect, we'd expect to see something a lot nastier than possible clusters near masts.
The "study" in the Sunday Times is so shit, I don't know where to begin.
Arts grads fake science for headlines
We know that cancers cluster for lots of reasons, varying from genetic mix of local populations, through to the materials that homes are made from (granite is bad stuff).
Comparing just two schools is so laughably stupid that even the arts grads at the Sunday Times should be embarrassed.
Mobile phones do have proven biological effects on the brain. Entertainingly the evidence so far sort of nearly implies that the effect is good, though I don't really believe that.
The effect that is so far beyond the artsgrad journos that may be causing cancer is ozone. Contrary to what you may have read about ozone, it is one of the nastiest chemicals known. It kills all life on contact, destroying anything remotely organic. It can be made by high voltage equipment, and is rather heavier than air, which means it theory it could "pool".
Ozone could be causing these cancers, and may explain the nearly-proven link with high voltage power lines and substations.
Or it may not.