Lenovo Vibe B ($ 0)

Features:
SensorsAccelerometer Compass Proximity  

Specifications:

BuildOSAndroid OS V6.0 (Marshmallow)  
Dimensions132.5x 66 x 9.9 mm  
Weight144 g  
SIMDual-SIM Dual Standby Mini-SIM  
ColorsBlack White Gold  
Frequency2G BandSIM1: GSM 850 / 900 / 1800 / 1900<
SIM2: GSM 850 / 900 / 1800 / 1900  
3G BandHSDPA 850 / 900 / 1900 / 2100  
4G BandLTE band 1(2100) 3(1800) 5(850) 7(2600) 8(900) 20(800) 38(2600) 40(2300) 41(2500)  
ProcessorCPU1.0 GHZ Quad-Core  
ChipsetMediaTek MT6735M  
GPUMali T720  
DisplayTechnologyTFT capacitive touchscreen 16M colors Multitouch  
Size4.5 inches  
Resolution480 x 854 pixels (~207 PPI pixel density)  
MemoryBuilt-in8GB built-in  1GB RAM  
CardmicroSD card (supports up to 32GB)  
CameraMain5 MP autofocus LED flash  
FeaturesGeoTagging Video  
Front2MP Camera  
ConnectivityWLANWi-Fi 802.11 b/g/n hotspot  
Bluetoothv4.0 with A2DP  
GPSYes + A-GPS support  
RadioFM radio  
USBmicroUSB v2.0  
NFCNo  
DataGPRS  EDGE 3G (HSPA 21.1/5.76 Mbps) 4G (LTE Cat4 150/50 Mbps)  
FeaturesSensorsAccelerometer Compass Proximity  
Audio3.5mm audio jack  
BrowserHTML5  
MessagingSMS(threaded view) MMS Email Push Mail IM  
GamesBuilt-in  
TorchYes  
ExtraDocument viewer Photo video/editor google Search Maps Gmail YouTube Calendar Google Talk MP3/WAV/eAAC+/FLAC player MP4/H.264 player Google talk  
BatteryCapacity2000 mAh  
Standbyup to 170 hrs  
Talktimeup to 11 hrs