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Cellular functionalities is different from internet data. See my comment above, but also, as an example: when your phone is about to receive a phone call, it broadcasts publicly to a very long lasting "temporary" ID on the cell towers near your last location. These are public messages that any $50 phone or device can listen to. My research in college was to detect if a victim was home or not given only a phone number and address.
Ah ok. I was thinking LTE for the data/internet part, not the cellular radio. Also, have a look at "Open Gateway" for more privacy nightmares.
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