Camera, Bluetooth + Sim
Memory Card support for song play, record voice, camera photos
Battery life 1.5 to 2 days in StandBy mode
Note that Only 1G network Sim works on this. So BSNL, Vodafone and Airtel sim will work (in Airtel, wherever 1G network supports there it will work)
BSNL works Best out of all networks as it stays more on 1G network.
No Problem AT ALL. Fully functional