I am a airtel sim card since 2014 and not happy with the network and range. I am using a 3G sim card. With its network coverage I am very disappointed. I can’t even use Internet on it. When I recharge my Internet 3G plan, It does not give that sufficient speeds as of the other telecom operators like Vodafone, jio etc. It gives maximum 150kbps speed when on 3G Internet pack. Talking about call drop, I don’t notice any call drops often. But it has no network in the places like underground parking, buildings such places I am unable to make a call. The only reason I don’t recommend this telecom operator because of their network coverage and worst 3G Internet speeds.