BB should implement this.
The YotaPhone 2 has two faces, zero gimmicks | The Verge
It fits right in with BB's emphasis on battery life, productivity, and functionality. One of the big selling points of the Passport is how great it is for reading text. Imagine if we could flip it over and read long documents without hurting our eyes and burning battery. There are so many worthwhile usage scenarios where this would be great.