YOU have it off but if you come in contact with a person who has it on, then their device logs you in their presence.
I’ll leave the phone at home or just turn it off?????
What mechanism would even support doing that? What evidence do you have that any of that is taking place? It would be very simple to test and it would blow up all over the news if it were real because privacy advocates would be losing their minds over it.
What authoritative source (not a conspiracy website) do you have documenting that this is a real thing?