[thisiscorrect]

Would using a "multiplexing" carrier like Google Fi (I don't know the real term for it) that can switch between several others at least reduce the value of this tracking?

[juunpp]

You're not suggesting to use Google Fi to reduce tracking, right?

In any case, multiplexing wouldn't stop the tracking, and they might as well figure out just as much about you.

[junon]

Had Google Fi when I moved to Germany from the US. They cut off my service because it wasn't allowed to live in Germany and use them.

Worked for a year then woke up day to have no phone number anymore and a completely rude support rep.

So, no. This isn't an option.

[aaaaaaaaata]

It'll reduce the value the high-level carrier derives at minimum.