The launch of the first YotaPhone was definitely disappointing. It was a device I wouldn't want by my side. Poor hardware quality, and lack of compatible software were two of the main reasons.
The second-generation YotaPhone (YotaPhone 2), however, comes with a bunch of changes, improved hardware. 
The design of the device has been completely changed, and now it has better quality screens (front and back, yes it has dual screens). Its processor is much more powerful and makes better use of the e-ink screen.
The mobile's built-in memory is 32GB without expansion capability, as you will see below in the detailed features, and its cameras are somewhat "small" for the demanding, with an 8MP rear camera and a 2.1MP front one.
The YotaPhone 2 is the flagship of Yota Devices and is the Russian answer to Chinese and American smartphones.
The YotaPhone combines a touchscreen on the front and an ePaper (E-Ink) display on the back, which is “Always On.” Don’t worry about the battery, it consumes very little energy. The E-ink display has extremely low consumption as we 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 (from messenger, social media, e-mail) and read ebooks even under bright sunlight. 
The Russian company Yota sells the Yotaphone 2 device globally and targets the average consumer and not 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)
Display with Corning Gorilla Glass 3 back panel
SIM Nano-SIM
Display type AMOLED capacitive touchscreen, 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 Quad-core 2.3 GHz Krait 400
GPU Adreno 330
Memory Card slot No
Disk 32 GB, RAM 2 GBRAM
Camera Primary 8 MP, autofocus, LED flash, check quality
Features Geo-tagging, touch focus, face detection, panorama, HDR, Accelerometer, gyro, proximity, compass
Video 1080p@30fps
Secondary camera 2.1 MP
3.5mm 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
Standby 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 h
Colors White – Black
It is worth mentioning that when the device was first released, it cost $787. If you are interested, you can get the device from Gearbest for $158.
