I feel like this is making people unnecessarily afraid. Most protests do not require you to do anything special with your phone. If you expect more confrontational or destructive actions to be happening then this is a good idea but most protests I’ve been to are not like this.
I did not. I’ve been to several protests and did not take any “security precautions”, nor did most people there. It was completely safe with no reason to think there would be repression.
The point of mass resistance is that the state does not have the power to arrest us all. If they did then we would need to use different tactics. But resisting brazenly is a demonstration of power and makes such an outcome less likely in the future.