An Android device called Katim, it was made available commercially Monday at Mobile World Congress in Barcelona, Spain, and has a 5.2-inch display, as well as a high level of encryption.

DarkMatter unveiled the phone concept last year but has now brought it to market.

One security feature built by the Middle East-based firm is called "shield mode," which disconnects power from the microphone and camera on the device so that nobody can spy on your conversations.

"If you are to enter a secure meeting or a very confidential meeting as a business, you are striking a secret deal, or as a government having a secret meeting in that regard... you always tend to find people leaving their phone outside the meeting," Fisal Al Bannai, CEO of DarkMatter, told CNBC in an interview Tuesday.

"It's because you can't trust that no one, no super agencies are able to turn on that mic while you are sitting in the room."

Al Bannai said the company has built the Katim smartphone from the "ground up" with security.

Shield mode is activated by flicking a button on the side of the device; the CEO said this makes it more secure.

"This button will physically disconnect the power from the mic and camera, which means unless that super agency has a way of physically shifting that button back, there is no way that mic is turning on and listening to what you're saying," Al Bannai said.

Privacy and spying via devices was thrust into the spotlight in 2016 when a photo emerged showing that Facebook CEO Mark Zuckerberg tapes up the webcam of his laptop.

DarkMatter is not the only provider of security-focused devices. On Tuesday, cybersecurity firm Sikur announced what it claims is a hack-proof smartphone designed to store cryptocurrencies securely. And at Mobile World Congress, Chinese electronics maker Huawei unveiled a new laptop called the MateBook X Pro that has a camera hidden in the keyboard.

Al Bannai also revealed that 2017 revenue hit $400 million, up from $200 million the year before.