How to make secure calls on Android?

Wanna make secure calls on android? Then you are at the right place!

We are gonna make encrypted phone calls with the help of Ostel.co .
This is an open source community projects, which do not keep logs or records of who is calling whom. And phone numbers are not tied to personal identifiers so you can remain truly anonymous.
Calls can be made over wifi or cell network.

About Ostel
Ostel is a tool for having end-to-end encrypted phone calls. Our goal is to promote the use of free, open protocols, standards and software, to power end-to-end secure voice communications on mobile devices, as well as with desktop computers.

Here is a complete step to step guide on how to do it.

1. Go to the website Ostel.co

2.Check out all the features of Ostel.

3.Scroll to the bottom and register an account.

4.Choose a name so your friends can find you.

5.Create a password.

6. Now your info is displayed below and send to your email.

7. Download CSipSimple for android.

8. Install CSipSimple on your device

9. Open CSipSimple

10. Press the key icon to add an account.

 

11. Add an account

12. Scroll down and click the Open Secure Telephony Network (OSTN) account wizard under Expert.

13. You'll find empty account info

14. We emailed you the account info.

15.  To confirm it works, you'll see OSTN turn green. We're registered!

16. Dial 9-1-9-6 to do an echo test.

17. In the echo test, you should be able to hear your own voice. Say cheese!

18. Great! Now lets call a friend.

19. A confirmation code will pop up, when the pick up the call. Read it to them. If both of you have the same code, you're secure.

Taken from: https://guardianproject.info/howto/callsecurely/

Here is a youtube video to help you
https://www.youtube.com/watch?v=BrNC8Mk26Z8

Here is the link of android app needed for making secure calls
https://play.google.com/store/apps/details?id=com.csipsimple

Resourses:  https://ostel.co/
                  https://guardianproject.info/howto/callsecurely/
                  https://www.youtube.com/watch?v=BrNC8Mk26Z8
                  https://play.google.com/store/apps/details?id=com.csipsimple