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nearby wifi networks, nearby cell phones, and also bluetooth devices. Even in airplane mode your phone is looking for beacons and keeping track of your location. Even when you turn your phone off entirely it doesn't give up (https://www.androidpolice.com/android-15-powered-off-finding...)

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They want accelerometer, temperature and other sensor data too where possible. Not just information on the strength of the wifi/cellular signal (and your estimated location). SIM cards can do the most on qualcomm devices.

Poking into both of these systems outside of a lab is definitely a violation of the law ordinarily and it's pretty hard to test this in a lab.

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