Why shouldn’t you bring your phone?

Edit for y’all who thought I don’t know what cell triangulation and gps tracking are: If you’re involved in protesting to the extent that you might be actively tracked, you should have the proper precautions in place on your phone that make it untraceable even when you’re carrying it with you.

Edit 2: “Proper precautions” includes using GrapheneOS with 2 SIMs. Only use one of those SIMs at protests and make sure to never use them at the same time. If the government is tracking you past that point, why do you even have a phone in the first place?