I am an Airtel user since my first cellphone. Airtel network used to be the best; during recent years the signal strength and quality is losing its high end qualities. My apartment is located in prime area of Delhi. The signal strength outside my home is extravagant but it is quite weak at some places inside my house.
I would give an average rating to airtel customer service. The reason being, the importance given to the customers when called for a query or a complaint.
Airtel charges more than any other service providers in India. Though, it has reduced its rates to compete wwith other providers in the market, the price offered cannot cope up with other prices in market.