Interestingly enough, per the above video, the governor has contracted with a company that does cell phone monitoring as well as area cell coverage denial to be present at the rally. I have some professional experience with this but am not affiliated with this company.
Remember several things:
If you have your phone there unshielded, expect to have all your data extracted. This includes, carrier, MAC address, contact list, etc. Your phone doesn’t need to be on to do this.
you can shield your phone in several ways. If you can take the battery out, that will
work. If not, you can wrap it in some sort of signal barrier material. Foil can do an ok job of this but it must be wrapped carefully and as soon as you remove it you go live.
Remember, radios are not attributable in this sort of setting. They are also cheap, small, and have decent battery life. You can get them at Walmart.
Trac phones are similar provided that you buy them with cash.
Unfortunately, I am out of the US and won’t be able to attend, but if I could, there is NO WAY that I would allow this tyrant to rip all the data off of my cell. If you don’t think that electronic surveillance will be present in many forms, you are naive. It is the forefront of modern warfare, and WILL be employed against you at a very high level.
Have multiple contingency plans. This governor has shown that he wants to provoke a confrontation with the people. We don’t know what he has up his sleeve. Make sure you can maneuver and exfil whenever you want.