Developer: Silent Circle
Cost: Pricing starts at $120/year, which also includes Silent Eyes, a tool to enable secure video chatting from desktops.
Available on Android too? Yes
Are you shocked by the NSA surveillance revelations? Do you think, "Hey, I'm not doing anything wrong, so this is a major invasion of my privacy"? If so, you might want to check out the Silent Phone and Silent Text apps, which securely encrypt calls, text messages and attachments against eavesdropping and monitoring. Silent Circle's technology encrypts calls and messages peer-to-peer, exclusively between users' devices, meaning there are no central encryption servers for attackers to target and compromise. With one Silent Circle subscription, you can activate the app on different devices including iPads, iPhones and desktops.