I am using Relaince and I have installed RWorld. The steps are as follows:-
Select Carrier Option i.e Reliance, Tataindicom, Virgin.
To get Rworld in Spice c-810. The steps are as follows :
MENU - CARRIER SERVICES - BREW APPLICATION - MOBILE SHOP - CATALOG - RMENU
download "RMENU"
to go rworld menu. the steps are as follow :-
MENU - CARRIER SERVICES - BREW APPLICATION - RMENU6000
I think the Tataindicom will be same.
Good luck