http://www.amazon.in/dp/B018VN229E
http://www.snapdeal.com/product/obi-worldphone-sf1-32gb-black/684759844944


Please follow these steps to set your SF1 camera to 13MP:
1. Open the camera application 2. Go to settings > Preview size 3. Select 4:3
13MP primary camera and 5MP front facing camera with flash.12.7 centimeters (5-inch) IPS capacitive touchscreen with 1080 x 1920 pixels resolution and 443 ppi pixel density.Android v5.0.2 Lollipop operating system with MSM8939 Qualcomm Snapdragon 615 octa core processor, 3GB RAM, 32GB internal memory expandable up to 64GB and dual SIM (4G+3G).Embedded 3000 mAh Li-Po battery providing talk-time of 28 hours and standby time of 480 hours and Quick ChargeTM .1 year manufacturer warranty for device and 6 months manufacturer warranty for in-box accessories including batteries from the date of purchase
Now your camera is ready for 13MP image.
Minimize background data by clearing all open applications through the tiny square box at the bottom right of the screen,keep the device activity to a minimum while it is charging and maintain the brightness of the phone to a moderate level.