I don't know how frequent you travel in train Airtel fails to deliver in moving train. I travel Bhopal, Ludhiana, Prayagraj, Banglore, Varanasi, Delhi, etc on regular basis and found Airtel fails to provide proper coverage in many remote areas including Rajasthan.Bad in your location doesn't mean bad everywhere.
Being in business for so many years if you fails to provide a proper coverage to remote areas and your competitor provide coverage in remote areas (personal experience) within just 7 days of complaint raise big question about your credibility.Correct. Being a telecom user for the last 21 years. I can say Airtel is the best in terms of coverage and service.