Airtel is one of the best network provider in india, across india its provide good signal either rural or urban and now days its start 4G service in delhi. its customer supporter have quick response.I have brought a new airet 4g hotspot on january 1st week.they have also offered me a new airtel sim and told me that I have got 1gb at rs 159 every time I recharge till 90 days.but after 1 month when I rechage thay told me that this is a invalid offer and I have to pay rs 174 for 1 gb and now days its increasing.I have been complaining on wrongfully overcharging my airtel connection.