I had been using Airtel for a long time. Whenever I used to travel rural areas the network will be low or of no coverage and I am a frequent user of mobile data and their charges were very high. So I had to use the mobile number portability scheme to a new network operator. Sometimes Airtel would charge me money for services that I didn’t activate by myself. I had lost large money by paying for services that were not activated by me. They claim to be India’s largest network but I don’t think so.