Airtel does not provide service which they guaranteed in the advertisement of the 4g the 4g area still restricted and there speed is worst in some area and is so expensive as a middle man cannot afford and there is need of a 4g phone is too and there connectivity is so poor which we can explain in the words in some area the 4 g is not applicable And there downloading speed are not so good and they charge high for each call and it not so easy too operate as it. Require some knowledge regarding network because some changes has to b made in the mobile settings