Speeds would be cut to half after crossing these limits:
256 - 10 GB
384 - 15 GB
512 - 25 GB
1 Mbps - 50 GB
Source: News: Airtel sets a limit to unlimited plans (Airtel Fair Usage Policy) - India Broadband Forum
256 - 10 GB
384 - 15 GB
512 - 25 GB
1 Mbps - 50 GB
Source: News: Airtel sets a limit to unlimited plans (Airtel Fair Usage Policy) - India Broadband Forum