You cannot type modern Unicode Hindi (like Google Input Tools) directly on the W902. You must convert it:
The Chanakya 902 doesn't use standard Unicode. It uses a specific Chanakya font encoding. walkman chanakya 902 hindi font 2
If you have a Chanakya 902 that shows corrupted Hindi (boxes or random English letters), follow this step-by-step guide. Warning: Flashing firmware or font files can brick your phone. Proceed at your own risk. You cannot type modern Unicode Hindi (like Google