I had purchased a SIM card when travelling to France this month. It worked very well, right from the moment I landed in Paris. This was the plan I bought:-
Mini Super Saver Addon Plan - Rs. 1600.00
200 minutes calling India / France
200MB high speed data
200 national sms
Free incoming
Free intercalling & SMS on same network Plan valid for 30 days
Everything worked very well and was well connected with family in India and Paris.