BlackBerry is a line of smartphones, tablets, and services originally designed and marketed by Canadian company BlackBerry Limited.
Features
Flat Design UI.
Permanent Homescreen (detachable)
Android 4.3 runtime with multicore support (however Android apps are limited to two cores even on quad-core devices like the Blackberry Passport)
Advanced Interactions.
Support for BlackBerry Blend.
BlackBerry Assistant.
Amazon Appstore preloaded.