As far as my openion is concerned airtel is the best network from all and it is the largest network in india and also it is old network service which are attract many user over the years. The network quality of this operator is so good it is work in every location whether it is urban area or rural area.
The customer service of this operator is also attract to their user by providing best call rates and coupon and all 3g and 4g charges which in very good prices and also gives good response to their user
The charging and billing are also very effective because of iis demand by every user the operator providing good charging facility with good pack of internet and calling system and broadband services.