Need some privacy? Open WhisperSystems

Open WhisperSystems, a company that is working on security and privacy in the mobile environment, provides a way to secure your communication with their mobile applications: RedPhone & TextSecure.

RedPhone

RedPhone provides end-to-end encryption for your calls, securing your conversations so that nobody can listen in.

Features:

• Use the default system dialer and contacts apps to make calls as you normally would. 
• RedPhone will give you the opportunity to upgrade to encrypted calls whenever possible. 
• RedPhone calls are encrypted end-to-end, but function just like you're used to. 
• RedPhone uses your normal phone number to make and receive calls, so you don't need yet another identifier.

TextSecure

TextSecure encrypts your text messages over the air and on your phone. It's almost identical to the normal text messaging application, and is just as easy to use.

Features:

• A full replacment for the default text messaging application. 
• All messages are encrypted locally, so if your phone is lost, your messages will be safe. 
• Messages to other TextSecure users are encrypted over the air, protecting your communication in transit.

The source for both projects is open, so that anyone can easily verify they work as advertised. They are licensed GPLv3 and will always be free.

Go to Open WhisperSystems