Don’t ever take a phone to a protest. They WILL use location data against you if your phone is on, Even if it’s off and you happen to lose it, they’ll use the fact that it was found at the scene against you.
If You’re going to protest, then protest. If I see you standing around taking pictures and videos with your phone I’m going to assume you’re just in it for your Instagram posts.
Edit:
And if you’re not careful when taking videos or pictures at a protest you could expose other protesters and your footage could be used to prosecute people that were there trying to help.
If you absolutely INSIST on documenting the protests, procure a used GoPro off of eBay or Facebook marketplace that isn’t registered to you and use that.