Are you slightly paranoid? Perhaps conducting a secret affair or planning industrial sabotage, terrorism or just heeding the words of Edward Snowden?
This smart little thing encrypts calls and messages and protects your Wi-Fi and other connectivity functions so people can't easily listen in to your ramblings.
The Blackphone
But there-in lies the key word easily. As Wired point out it's not NSA-proof, just a bit more secure than your average smartphone.
Spec-wise, it's farily standard for today's new phones - 4.7-inch LCD touchscreen, a 2GHz quad-core CPU, 2GB of RAM, 16GB of storage (no microSD slot though), 4G LTE and an 8-megapixel camera.
As an extra measure the phone comes with Silent Circle, the peer-to-peer encrypted service and also uses a version of Android called PrivatOS.
It also has a few tricks like a free Wi-Fi analyser and a remote wipe and recovery tool.