as a civilian until they roll out the tanks, and your guns can’t do shit against tanks.

CIA would like to present you Simple Sabotage Field Manual solving all your needs in that department.

https://en.wikipedia.org/wiki/Simple_Sabotage_Field_Manual

So what does it actually do?

It replaces the launcher (“desktop”) of your phone with something else. Maybe something faster, or using less resources, or something you can customize to your taste.