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This Company Will Add Phone, AirPod, and Smartwatch Trackers to License Plate Readers
(www.404media.co)
This is a most excellent place for technology news and articles.
A little overkill for most people.
There's no IMSI tracking through WiFi afaik, only cell service.
Airplane mode, VPN, and messaging apps is pretty good. I believe randomized MAC is the default on Android so no need to modify there. (Though it's nice to disable that on your home network so you can track yourself.)
Could be overkill, but if you're out and about your cell data is likely on. Then what? Now, my phone, my laptop, or other devices can utilize it. Unlimited data.