Xiaomi Redmi Pro Mini ($ 0)

Features:
SensorsAccelerometer, Gyro, Compass, Proximity, FingerPrint

Specifications:

BuildOSAndroid OS V6.0 (Marshmallow)
DimensionsN/a
WeightN/a
SIMDual-SIM, Dual Standby, Nano-SIM
ColorsVarious
Frequency2G BandSIM1: GSM 900 / 1800 / 1900
SIM2: GSM 900 / 1800 / 1900
3G BandHSDPA 850 / 900 / 1900 / 2100
4G BandLTE
ProcessorCPU1.8 GHz octa-core Cortex-A72
ChipsetQualcomm's Snapdragon 652 chipset
DisplayTechnologyLTPS-AMOLED Display, Multitouch
Size5.2 inches
Resolution1080 x 1920 pixels
MemoryBuilt-in32GB built-in, 3/4GB RAM, 128GB built-in, 4GB RAM
CardMicro SD card
CameraMainNo
FeaturesYES
FrontNo
ConnectivityWLANWi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, DLNA, hotspot
Bluetoothv4.1 with A2DP, LE
GPSYes + A-GPS support & Glonass, BDS
RadioFM radio (not yet confirmed)
USBType-C 1.0 reversible connectoro
NFCYes
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
TorchNo
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
BatteryCapacity4000 mAh