Stolen from another post:

"you need around 6 layers of tin foil you can test this if you have a bluetooth device start playing some music or any audio and start wrapping in tinfoil until it disconnects id also say to leave your phone at home sk it pings the cell towers that you are at home and bring a burner if you can and make sure the burner is private so use cash prepaid sims and dont put the sim in at home or work make sure its all a mall away from cameras"

Be safe tomorrow everyone

Some very cheap phones with minutes included, here:

https://www.qvc.com/electronics/phones/tracfone/_/N-mlt0Z1z1393y/c.html

OTOH they can probably be traced back to you since you have to order them with your presumably real name. You can buy phones and prepaid cards anonymously in phone stores but it will cost more.

The powers that you are necessarily taking these precautions against are all funded by your taxes.

I learned this recently: if you have an iPhone, pressing the lock button five times rapidly will lock it so that you need to enter a passcode, not just FaceID. Useful if you think somebody might forcibly use your face to unlock it