Governments and carriers retaining months of location history data is a risk. If the Russians invade and get a hold of that data, a lot of people suddenly become at risk, for no good reason other than it being around "just in case".
We've seen it happen here in the Netherlands when the nazis came in and happily browsed through the city archives, which contained a details count of how many people of what religion lived in each neighbourhood.
I have nothing to fear from the current government, but with the rise in ultraconservative, anti-intellectual, extreme right wing politicians across the globe, a lot of people may not want to be recorded having been to things that are perfectly safe today.
All of that said, as long as you don't have an iPhone, you can just turn your phone off. It'll power down the CPU. If you don't believe the manufacturer, then you'll have to measure the voltage on the PCB traces yourself, but so should you when you buy phones with a physical off switch.