The release of the first YotaPhone certainly disappointed. It was a device I would not want next to me. Poor hardware quality, and lack of compatible software were two of the main reasons.
The second-generation YotaPhone (YotaPhone 2) but it comes with a lot of changes, improved hardware. 
The design of the device has changed completely, and now it has screens (front back, yes it has a dual screen) of better quality. Its processor is much more powerful and makes better use of the screen's e-ink.
The built-in μνήμη of mobile είναι 32GB χωρίς δυνατότητα επέκτασης όπως θα δείτε παρακάτω στα αναλυτικά χαρακτηριστικά, και οι cameras they are somewhat "small" for demanding users, with an 8MP rear camera and a 2.1MP front camera.
YotaPhone 2 is the flagship of Yota Devices and is the Russian answer to smartphones in China and America.
The YotaPhone combines a touch screen on the front and an ePaper (E-Ink) technology display on the back, which is "Always On." Do not be afraid of the battery, it consumes minimal energy. The E-ink screen has extremely low consumption as mentioned above, which gives the Yotaphone 2, from 2 to 5 days of autonomy.
Its battery is non-removable at 2500mAh with fast charging function, and wireless charging support. The second screen allows you to receive various notifications there (from messenger, social media, e-mail) and read ebooks even in bright sunlight. 
The Russian company Yota has the Yotaphone 2 device globally and targets the average consumer rather than those who want the latest technology, although its features as you will see below are very decent:
Network GSM / HSPA / LTE
Dimensions 144.9 x 69.4 x 9 mm (5.70 x 2.73 x 0.35 in)
Weight 145 g (5.11 oz)
Screen with Corning Gorilla Glass 3 back panel
SIMs. Nano-SIM Card
screen type AMOLED capacitive touch screen, 16M colors
Screen size 5.0 inches (~ 68.2% screen-to-body ratio)
Resolution 1080 x 1920 pixels (~ 442 ppi pixel density)
Multitouch Yes
Protection Corning Gorilla Glass 3 - Secondary always-on grayscale capacitive touchscreen, 540 x 960 pixels (235 ppi), 4.7 inches
OS Android OS, v4.4.3 (KitKat), upgradable to v5.0 (Lollipop)
Processor Qualcomm Snapdragon 801
CPU GHz Krait quad-core 2.3 400
GPU Adreno 330
Memory Card slot None
Disc 32 GB, RAM 2 GBRAM
Primary Camera 8 MP, autofocus, LED flash, check quality
Specifications Geo-tagging, touch focus, face detection, panorama, HDR, Accelerometer, gyro, proximity, compass
Video 1080p @ 30fps
Secondary camera 2.1 MP
3.5 jack Yes
Comms WLAN Wi-Fi 802.11 a / b / g / n / ac, dual-band, hotspot
Bluetooth v4.0, A2DP
GPS Yes, with A-GPS, GLONASS
NFC Yes
Radio FM radio
USB microUSB v2.0
Battery Non-removable Li-Ion 2500 mAh battery
Stand by Up to 397 h (2G) / Up to 406 h (3G)
Talk time Up to 41 h 40 min (2G) / Up to 26 h (3G)
Music play Up to 92 hours
Colors White - Black
It is worth mentioning that when the device was first launched, it cost 787 dollars. If you are interested you can get the device from Gearbest with 158 dollars.
