Lenovo S860 ($ 323)

Features:
SensorsAccelerometer Proximity  

Specifications:

BuildOSAndroid OS v4.2 (Jelly Bean) upgradable to v4.4.2 (KitKat)  
Dimensions149.5 x 77 x 10.3 mm  
Weight190 g  
SIMDual-SIM Dual Standby  
ColorsTitanium  
Frequency2G BandSim1: 900 / 1800 / 1900
Sim2: 900 / 1800 / 1900  
3G BandHSDPA 900 / 2100  
ProcessorCPU1.3 GHz Quad-core Cortex-A7  
ChipsetMediatek MT6582  
GPUMali-400MP2  
DisplayTechnologyIPS LCD capacitive touchscreen 16M colors Multitouch up to 5 fingers  
Size5.3 inches  
Resolution720 x 1280 pixels (~277 ppi pixel density)  
MemoryBuilt-in16GB built-in  2GB RAM  
CardNo  
CameraMain8MP 3264 x 2448 pixels autofocus LED flash  
FeaturesGeo-tagging touch focus face detection HDR Video  
Front1.6MP  
ConnectivityWLANWi-Fi 802.11 b/g/n Wi-Fi hotspot  
Bluetoothv3.0 with A2DP  
GPSYes + A-GPS support  
RadioFM radio (To Be Decided)  
USBmicroUSB v2.0  
NFCNo  
DataGPRS  EDGE 3G (HSDPA 21 Mbps; HSUPA 5.76 Mbps)  
FeaturesSensorsAccelerometer Proximity  
Audio3.5mm audio jack  
BrowserHTML  
MessagingSMS(threaded view) MMS Email Push Mail IM  
TorchYes  
ExtraOrganizer Document viewer Active noise cancellation with dedicated mic Photo viewer/editor Voice memo/dial Predictive text input Google Search Maps Gmail YouTube Calendar Google Talk  
BatteryCapacity4000 mAh  
Standbyup to 684 h  
Talktimeup to 43 hrs