My home is in Bengaluru itself. I stay here 99% of the time. Airtel is unusable. My mom uses it and call drops and dead zones are constant throughout the way to her office. But she refuses to port out to Jio which is way superior to Airtel in most areas of Bengaluru. You might be staying in one of the lucky few areas which gets decent Airtel coverage since its pathetic in the rest of the city. I'm not saying Jio is the best. Its network is unusable in many areas as well, but Airtel is hands down the worst provider in Karnataka and only coasting on its brand name of yore.You might not be staying in Bangalore all the days.
Just as recently as this Wednesday evening, my mom called me thrice and put a message on WhatsApp. The message on WhatsApp I received, but when she called me it was coming as switched off. We had a fight over this..
Same other way round also was there until few weeks ago. Kerala situation is even worse than Bangalore. There VoLTE drops once every 2 hours. I got my mom ported out of Jio into Airtel Black..
Airtel is infinitely better, VoLTE is more reliable and available.