The Yotaphone is not the only smartphone making use of an eReader-style display-- the MIDIA InkPhone is another smartphone using the display technology, if without the additional LCD touchscreen.
Seen at CeBIT 2014, the InkPhone carries a 4.3-inch eInk Flex display, 1GHz processor, 512MB RAM, 4GB storage and a 1800 mAh battery promising up to 2 weeks of use on a single charge. How so? Through the eInk display, of course.
“Low capacity of batteries is a weakness of modern smartphones,” Chinese eReader maker Onyx says "That is a consequence of using large LCD displays and many aplications that works in the background when device is running.”
However the same display allowing for such battery life is also cause for the device being a barebones number-- the InkPhone handles calls and SMS, but features no apps other than an Onyx BOOX ereader.
Technically users can install app APKs manually, but the company does not guarantee minimum usability and quality levels.
Either way, the MIDIA InkPhone will be available in Europe from April 2014.