Range of a network is a major problem in India and airtel has the widest range among all the network operators. I having personally used airtel and so can assure you it is the best available network operator in India with least amount call drops.It has also got the maximum number of towers all over India which provides great network coverage across the country.
Being the largest network operator in India it also has the maximum number of call centers all over the country, which helps in solving the customer complains quickly and to perfection. It offers great full talktime plans along with cashback for it costumers. And not just this it has the best plans for the youth by far like unlimited calling at very cheap rates at night.
But all these facilities have made it an expensive network as compared to others mainly for the people who use network only for calling purpose and not internet. But for the youth it is the best available in the country.