RedPhone

Concerned that your phone calls might be being spied on? Get RedPhone and converse at ease in the knowledge that your communications are encrypted

Absolutely secure calls on Android

For several years, smartphone users have worried that someone or a secret service could eavesdrop on their communications. Because of this, some developers have started creating applications like RedPhone: an app that allows end-to-end encryption of calls and includes the options listed below.

Main features

• The calls are encrypted end-to-end.
• Uses regular phone number to make and receive calls without requiring caller ID.
• Doesn't consume voice minutes, but uses the data or WiFi plan.
• All calls are free.
• Uses the system's normal dialing function and standard contact applications.
• The service is free and open source.

It's an application that hasn't been updated for several years and is no longer supported by the developer, so it may not work properly. There's a good reason for that though: its makers are the studio Open Whisper Systems, the same people currently responsible for the Signal app. If you liked the call encryption app, we recommend you download this messaging app, which also focuses on end-to-end message encryption and is available from Malavida.

Requirements and further information:

• Minimum operating system requirements: Android 2.3.