Idea.as the name suggests is just a thought.but the aditya group has made it such a good brand.in india everyone praises airtel but strictly say that idea is the best brand in mobile networs.there are no call drops what so ever.every where there is good connectivity.and also its 4G WHICH IS IN ONLY SOME STATES is very fast as compared to taht of the boastful airtel.but I must admit airtel is better in one aspect than idea.and that is making fool out of the customers.my father always paid the postpaid bill on time but every single time they used to credit the bill and my father had to pay the extra charge.so guys beware.try for yourself.