Xiaomi Redmi Note 4X ($ 0)

Features:
SensorsAccelerometer, Gyro, Compass, Proximity, FingerPrint

Specifications:

BuildOSAndroid OS, v6.0 (Marshmallow)
UIMIUI 8.0
Dimensions151 x 76 x 8.5 mm
Weight165 g
SIMDual-SIM, Dual Standby, Micro/Nano-SIM
ColorsVarious
Frequency2G BandSIM1: GSM 900 / 1800 / 1900
SIM2: GSM 900 / 1800 / 1900
3G BandHSDPA 850 / 900 / 1900 / 2100
4G BandLTE band 1(2100), 3(1800), 5(850), 7(2600), 38(2600), 39(1900), 40(2300), 41(2500)
ProcessorCPU2.0 GHz Octa-Core Cortex-A53
ChipsetQualcomm MSM8953 Snapdragon 625
GPUAdreno 506
DisplayTechnologyIPS LCD capacitive touchscreen, 16M colors, Multitouch
Size5.5 inches
Resolution1080 x 1920 pixels (~401 PPI pixel density)
MemoryBuilt-in32GB built-in, 3GB RAM, 64GB built-in, 4GB RAM
CardNo
CameraMain13 MP, autofocus, dual-LED + dual tone) flash
Featuresf/2.0, phase detection, 1.12 µm pixel size, geo-tagging, touch focus, face detection, panorama, HDR, Video (1080p@30fps, 720p@120fps)
Front5 MP, f/2.0, 1080p
ConnectivityWLANWi-Fi 802.11 a/b/g/n/ac, dual-band, WiFi Direct, hotspot
Bluetoothv4.2 with A2DP, LE
GPSYes + A-GPS support & Glonass, BDS
RadioFM radio (not yet confirmed)
USBmicroUSB v2.0, USB On-The-Go
NFCYes
InfraredYes
DataGPRS, EDGE, 3G HSPA, 4G LTE
FeaturesSensorsAccelerometer, Gyro, Compass, Proximity, FingerPrint
Audio3.5mm audio jack, Speakerphone
BrowserHTML5
MessagingSMS(threaded view), MMS, Email, Push Mail, IM
Gamesbuilt-in + downloadable
TorchYes
ExtraFast battery charging, Active noise cancellation with dedicated mic, Photo/video editor, Document viewer, Google Search, Maps, Gmail, Document viewer, 24-bit/192kHz audio, XviD/MP4/H.265 player, MP3/WAV/eAAC+/Flac player, YouTube, Google Talk
BatteryCapacity4100 mAh
- Non-removable