It is one of the best telecom network in india along with jio and bsnl in my phone signal is always high and now airtel has started its 4g network in my town and believe me its damn too speed giving upto 41mbps of download speed and upto 19 mbps that is unbelievable never used a internet connectivity of that high speed and airtel give me a 2GB free 4G data kudos to them and their customer support is good too and there is one thing also airtel offers is that if you play ad in your hellotune than for each played in your hellotune you get 10 paisa free for everytime anyone call you.So I think overall airtel is nice telecom operator which is giving nice offers in comparison to jio and its call voice quality is also good if you have 4G sim then you can enjoy its all features and quality calls in airtel.