[jeffrey8chang]

For the point of "Start using encrypted communications channels" while protesting, here's a way to encrypt your voice:

https://www.kickstarter.com/projects/620001568/jackpair-safe...

It's a low-cost alternative to BlackPhone etc.

[rg3]

If you already have an Android phone, I guess the RedPhone app is the most convenient and cheap way to make encrypted voice calls.

https://play.google.com/store/apps/details?id=org.thoughtcri...

[jeffrey8chang]

The other party you called must use Android phone + RedPhone app as well.

[13throwaway]

Redphone can talk to iPhone users with the signal app.