Xiaomi Redmi 4 ($ 0)

Features:
SensorsAccelerometer, Gyro, Compass, Proximity, FingerPrint

Specifications:

BuildOSAndroid OS V6.0 (Marshmallow)
DimensionsN/a
WeightN/a
SIMDual-SIM, Dual Standby, Nano-SIM
ColorsGold, Dark Gray, Silver
Frequency2G BandSIM1: GSM 900 / 1800 / 1900
SIM2: GSM 900 / 1800 / 1900
3G BandHSDPA 850 / 900 / 1900 / 2100
4G BandLTE
ProcessorCPU2.0 GHZ Octa-Core Cortex-A53
ChipsetSnapdragon 625 chipset
GPUAdreno 506
DisplayTechnologyIPS capacitive touchscreen, 16M colors, Multitouch
Size5.0 inches
Resolution1080 x 1920 pixels (~441 ppi pixel density)
MemoryBuilt-in32GB built-in, 3GB RAM
CardMicroSD card (support up to 256GB) (uses SIM 2 slot)
CameraMain13 MP, autofocus, LED flash
FeaturesF/2.0, phase detection, Geo-tagging, touch focus, face/smile detection, HDR, panorama, Video (1080p@30fps)
Front5 MP Camera, f/2.2, 1080p
ConnectivityWLANWi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot
Bluetoothv4.1 with A2DP
GPSYes + A-GPS support & Glonass, BDS
RadioFM radio
USBmicroUSB v2.0
NFCYes
InfraredYes
DataGPRS, EDGE, 3G HSPA, 4G LTE Cat7
FeaturesSensorsAccelerometer, Gyro, Compass, Proximity, FingerPrint
Audio3.5mm audio jack, Speakerphone
BrowserHTML5
MessagingSMS(threaded view), MMS, Email, Push Mail, IM
Gamesbuilt-in + downloadable
TorchYes
ExtraGPS + A-GPS support & GLONASS, BDS, Dual SIM + Nano-SIM, dual stand-by), Active noise cancellation with dedicated mic, Photo/video editor, Document viewer, Google Search, Maps, Gmail, Document viewer, MP4/H.265 player, MP3/WAV/eAAC+/Flac player, YouTube, Google Talk
BatteryCapacity4100 mAh