Smartphones have the processing power of desktop computers from not too long ago.
They have been miniaturized but still radiate microwave frequency energy
from the electronics within all the time they are turned on.
The higher the frequencies ,the greater the energy.
They are not inert like a book.
They are kept alive with un-natural energy.
They are detrimental to your health while active.
They are death ray generators.
So are these towers of doom.

They also regularly transmit a location code signal so the main system can know what cell u are in.
This is an example of what you can find on every conductor around and in yu.