If you see BOXES, your device does NOT support Telugu.
1. Goto Settings -> Language and Keyboards
2. Enable Just Telugu
3. Select “Input method” -> then JustTelugu
Works only if
1. Telugu Font Installed
2. Device Complex Font Rendering.
Latest Indian firmwares supports these.
All Device above 4.2 Jelly Bean.
Report any issues or requests here or mail to firstname.lastname@example.org