I have been a user of airtel prepaid for the past few months now, The airtel network is good in cities but when we move far away from city the signal got weaker and weaker at some places very difficult to get the signal. The tariff rates are also in little high and after the introduction of 4G in india, the internet package tariff had gone more higher with less amount of data available, so mant would prefer to buy their own wifi. The call rates are some what ok.