I use a 1mbps connection and the Fair Usage Policy is definitely 100GB, after which the speed reduces to half. This has happened twice now. Besides the airtel website that clearly shows the Fair Usage Policy limit at 100GB for 1mbps, the airtel online billing page shows your usage absolutely clearly until that point of time. The first time my Fair Usage Policy crossed this limit and the speed went half, I had called the Ccare and was asked to double check from Airtel billing site, where I could clearly see it having crossed 100GB. Get your login & password for the website, you can request for it online. This is way better and sure way of confirming info and the correct usage than calling the Ccare and waste a good 15 minutes of your lifespan!