Taking out the battery out of your cell phone oughta do it.
The Samsung 5 & 7 has that removable battery feature.
Putting your cell phone in an RFID blocking pouch should work as well.
RE: “[ I run a cell phone tracking company. Turning off your phone isn’t enough. ]
Correct.”
Yes. Wherever you remove it, that is your last known location, all other things being equal (meaning assuming no reserve capacity built into the phone).