At a minimum, don't allow a mobile phone app the see location data unless it really needs it (ie: web browsers, hotel reservations, social media, etc.). Sure, there may be some marginal benefit in specific situations for the app to know your location, but really those features are mostly fluff. Also, even for apps that actually need GPS (ie: Maps, Uber, etc.), there is no need to let it access your location when the app is not open.
"Do not seek to follow in the footsteps of the wise. Instead, seek what they sought." - Matsuo Basho