RFID powers your contactless bankcard (PayWave, Paypass etc) and ePassport. Handy at the checkout but trivial to remotely steal or ‘skim’ your data for identity theft.
Cell frequencies carry your voice, texts, emails and Facestagram updates which is cool. Not so cool is that cell towers can be used for geolocation.
GPS is accurate to within a few meters anywhere on the planet. Awesome when you’re lost in Marrakesh. Not so great when the government and Silicon Valley know where you are at all times.
WiFi is wonderful and we can’t live without a relentless stream of cat memes either. But it’s also the third best way to track location (after GPS and Cell).