Hi All, I am using Airtel SIM from last 10 Years back. I am using prepaid mobile connections. I am getting good service from airtel about all the accessories. the internet speed is good according to the network of 2G 3G and 4G. Voice is clear while talking to peoples . Airtel is offering best plans about internet as well as voice calling .if you have 4G Phone you can make a video call with the clarity. customer service is very good, getting resolution on the spot.