I don't have data on my phone....
A lot (millions) of people are using Apple pay on their phones, or just shopping at Amazon, buying tickets, or even just using their calendar track expenses, appointments and events. Not to mention texting with.... who knows... or saving pictures of... I can't even imagine what. Everything you buy, everywhere you go, every communication is recorded and shared.
The collected bits and pieces of data that are left dangling here and there are very likely collected by...
more than one... government source at any given time. But the individual data points are
meaningless.
Imagine the data out there being like people at a rock concert. Everyone is talking, singing, cheering laughing, whispering thing in each others ears. If you record the sound to you phone you can play it back later and decide that 35,000 people were having fun. But you'll never know anything of the individuals that attended the concert.