Xiaomi Redmi 3x ($ 0)

Features:
SensorsAccelerometer, Gyro, Compass, Proximity, FingerPrint

Specifications:

BuildOSAndroid OS, v6.0 (Marshmallow)
Dimensions139.7 x 69.7 x 8.5mm
Weight144g
SIMDual-SIM, Dual Standby, Micro/Nano-SIM
ColorsSilver, Gold
Frequency2G BandSIM1: GSM 900 / 1800 / 1900
SIM2: GSM 900 / 1800 / 1900
3G BandHSDPA 850 / 900 / 1900 / 2100
4G BandLTE
ProcessorCPUOcta-core
ChipsetSnapdragon 430 chipset
DisplayTechnologyIPS LCD capacitive touchscreen, 16M colors, Multitouch
Size5.0 inches
Resolution720 x 1280 pixels
MemoryBuilt-in32GB built-in, 2GB RAM
CardMicroSD Card (support up to 128GB)
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
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
NFCNo
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, DivX/Xvid/MP4/H.264 player, MP3/WAV/eAAC+/FLAC player, YouTube, Google Talk
BatteryCapacity4100mAh