Airtel is on of my favorite mobile operator because they provide a good facility like network, its recharge.etc. there is no any problem regarding this mobile operator in my mind and In my family there is 4 people including me uses airtel mobile operator.I had never feel problems for this network.
Also they provide a good customer service because Once time My data speed gone very low of something 50kbps
and when I call the customer service centre regarding this problem.Then the customer provider help me and then my data speed find their normal speed.