Airtel does have a good network across India, but still I am facing issues with voice calls and 4g in Bangalore.
Raised complaint with Airtel and engineer visited my place, checked with some airtel application and marked that yes coverage is not so good. He said report will be shared to Airtel and soon you will have a good coverage.
Post that got a message that please rate our service quality but still network issue persist.
Better to switch to Vodafone.
