Airtel network is good as its network are very strong in mumbai as we travel any where in mumbai it network is good as I am using this service for more than five year and I did not have any problem with it it only problem is billing systrm as charge extra from has in every bill they send to us as you know service provider from any telecom company they charge extra in every bill and they tell it is right as I recomment to you airtel service but be carefull with there billing system