The following apps allow you to make free worldwide calls to other people that have the same app installed. Security wise, not only are your calls encrypted, additionally, VoIP apps bypass data retention laws, calls made with a calling app are not recorded by your network provider.
The best apps to make a secure call are those that are open source, available for Android and iPhone and encrypt your call with keys you only hold, you should also try to go with a company that does not have servers or offices in a country where mass surveillance is known to take place.
RedPhone: Free worldwide end to end encrypted calls implementing the open standard ZRTP, app source code is open to review, there is no need for another ID, this app will use your everyday phone number to make and receive secure calls.
Simlar: Developed in Germany, open source app to establish end to end encrypted calls with the ZRTP protocol, a cryptographic key agreement for VoIP calls, not even Simlar developers can listen in to the calls. To protect from man-in-the-middle attacks, Simlar shows a small code on the screen that can be read to your contact to confirm that you are both looking at the same.
Secure voice calls Simlar app
Wiper: This app keeps no logs of the encrypted calls, it can also be used to send messages with a wipe option that will erase them from the wiper server, your phone and your friend’s handset, making later recovery impossible. An integrated Bitcoin wallet in Wiper lets you receive or send payments without leaving the encrypted chat, transactions will show on the same screen.
Zoiper: Encrypted VoIP calls with TLS/SRTP and ZRTP protocols, this softphone can be used in Windows and Linux desktop computers as well as mobile phones, it appears to be targeting the business market. The program can be used in a call centre, hooking up remote workers with a business telephone system.
CoverMe: Full mobile phone communications suite securing calls, messages, files and phone storage. CoverMe encrypts your calls, sends selfdestructing text messages and creates an encrypted vault in your phone where to store private data. A decoy password can be set up in the event that you are forced you to reveal it, the app also assigns you a US phone number that can be used to receive calls.
CoverMe secure Android calls
CryptTalk (subscription): Peer to peer encrypted calls using standard algorithms and perfect forward secrecy without any server involved in the process, only communicating parties have access to the encryptions keys, third party decryption of text messages is not possible. A monthly subscription is required to use this service after the trial period but you can use it for free indefinitely in receiver mode.
Signal: Compatible with the Redphone app in Android from the same developers. Signal is open source, using ZRTP for secure voice communications. Calling somebody who has not installed Signal will be trigger an SMS link prompting them to download it. The company plans to add secure text messaging that will be compatible with TextSecure and a future release of an Android version.
jennifa
Hello,
Zoiper does not use ZRTP…
Do you know any other Software for PCs with end to end encryption that is not Jitsi?
The same
Hello,
I have the same question are there any other programs for PCs with end to end encryption?
boby
Here a new app for text messages without using data(internet :
https://smssecure.org/
james
Wich APP from this APP is OpenSource?
Only Redphone and Simlar?
Selina
I will share my experience:
Till now i have tested all and the best was Simlar the voice quality is the best!
I can only say keep working Simlar
Michael
Silent circle is the best it invented ZRTP yet is not mentioned here. It is the only encrypted program used by the FBI and US Navy seals.
hacker10
Hello Michael,
There are a ton of apps that encrypt mobile phone calls and new ones appear and dissapear all the time, it just wasn’t possible to include all of them but if one of the companies mentioned above goes under I will update the post with Silent Circle, I heard of them and they are very compromised with privacy and do not support backdoors.
Thank you for your comment
hacker10
Joss
I use CoverMe. It does exactly what it says it does. Functionality is strait and to the point. Sharing of information that is meant to be private and stay private is key. Has a nice feature that is movement sensitive so if someone grabs the phone from your hand, the sudden motion locks the screen. Picture and video vault are nice to have to keep private things private. The only way to get them is to try and find them with third party software on a laptop to look at all the file on your phone. Do not expect to back up any of your private info, there is not an export function. Overall super thrilled to have this app.