Airtel is one of the biggest telecom mobile operator of India now due to its good, wide network which gives the best 4G speed currently in India. Their network towers are almost in all parts of India from small villages to big cities. Their customer service is above average. They are available on phone and twitter from 10 am to 8 pm. Their customer care number is 09898252062. They have recently launched very cheap and value for money plans due to their competitor Reliance Jio. But Airtel provides the best 4G speed right now as a sim card operator.