LET ME SET THE RECORD STRAIGHT..
If you have GPS on your phone and it even if the phone is switched off, they can STILL track you, especially if you have MAPS on your phone.....just take at look at your history...it tracks every movement.
Most new phones, you CANNOT take the battery out! iPhone, Motorola Moto E etc so switching OFF is FUTILE!
I have stopped being paranoid.....Big Bruvver has more important fish to fry than a few hippiesw or the odd talk of revolution or anarchy or weed.......they are monitoring mainly for Daesh/ISIS /trrror threats these days and HUGE drug operations and people smuggling. if you aint doing anything major wrong, then you aint got jack to worry about...if on the other hab, you DO have something to worry about, do NOT have phone/internet simples