Network: I am a airtel user since 5-6 years. once I have gone to my native village its was working as it is working in my place. its best thing it is best for calling and surfing internet. airtel gives a sim offer of 2G/3G/4G which is run best in india and it is among the second largest mobile network in india.
customer service: its customer service executive are very respectful and way of talking I like the best and they try their best to satisfy their customer.
charges and billing: they have have to mode of payment first is prepaid and postpaid. only the official worker prefer postpaid and most of them uses prepaid which is expensive for some people its 2G enpenses are low but 4G offers are too expensive.