Airtel is a renowned mobile service provider I have used their prepaid services never used their postpaid services. The services provided are good but the thing I hate is their customer support they seriously need to improve a lot.
The internet services are good you may get a decent internet speed depending upon your area of operation but their data packs are costly you may get a great data services from other providers in the area. So, finally I want to say that the airtel services are good but while comparing it with other operators in the market it fails.