Xiaomi Redmi 3s Prime ($ 0)

Features:
SensorsAccelerometer, Gyro, Compass, Proximity, FingerPrint

Specifications:

BuildOSAndroid OS, v6.0.1 (Marshmallow)
Dimensions139.3 x 69.6 x 8.5 mm
Weight144 g
SIMDual-SIM, Dual Standby, Micro/Nano-SIM
ColorsGold, Dark Gray, Silver
Frequency2G BandSIM1: GSM 900 / 1800
SIm2: GSM 900 / 1800
3G BandHSDPA 900 / 2100
4G BandLTE
ProcessorCPU1.4 GHz Octa-Core Cortex-A53
ChipsetQualcomm MSM8937 Snapdragon 430
GPUAdreno 505
DisplayTechnologyIPS LCD capacitive touchscreen, 16M colors, Multitouch, MIUI 8
Size5.0 inches
Resolution720 x 1280 pixels (~294 ppi pixel density)
MemoryBuilt-in32GB built-in, 3GB RAM
CardMicroSD Card (support up to 256GB) (uses SIM slot 2)
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
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
ExtraGPS + A-GPS support & GLONASS, BDS, Dual SIM + Micro-SIM / Nano-SIM, dual stand-by), Fast 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
BatteryCapacity4100 mAh
- Non-removable