Not directly, but it is possible with a workaround. Basically, Blackberry have blocked the ability for software applications to control the microphone during a call (for privacy protection reasons). There is no app on the market that can record voice calls directly from the device. We do, however, have a workaround available that enables you to record calls even if the target phone is a Blackberry device. The workaround requires you to have a spare Android device, Windows computer with internet access and a USB cable. Calls to and from the Blackberry device will be routed through your spare Android device and recorded. They’ll then be uploaded to your control panel as normal and you can listen to them through your browser or download them to play on your computer or media player.
Android Call Recording Compatibility
Which Countries does Guardian work in?
iOS Messaging App Compatibility March 2016
iOS Device and App Specific Limitations
Android Device and App Specific Limitations
Android Messaging App Compatibility March 2016