Also-remove facial recognition from your phone! They cannot make you speak your PIN code to them, but they CAN hold your phone to your face to unlock it and access it. They could also place your finger on your phone, if you still have fingerprint locking. Another reason to not bring your phone!
Comments
Unless you have an old phone that allows you to remove your battery
https://hellosmartlife.com/can-a-smartphone-be-tracked-if-it-is-turned-off/
Tracking in general:
https://www.aclu.org/issues/privacy-technology/location-tracking/location-tracking-cell-phone-privacy