Facebook Mobile site 0.Facebook.com has no data transfer fees and this is free to use around the globe for certain mobile operators. In India Reliance, Videocon connection there is no cost for accessing.
Previously Facebook lite was launched for low-bandwidth but later 0.Facebook.com stopped the use of Facebook lite as it has no data transfer fees.
0.Facebook.com: No data transfer fees
But not all mobile operator allows you to reduce cost. Only Reliance, Videocon connection allows to stop paying for accessing Facebook via mobile.
As Facebook is growing and popular day by day and this new features are very useful for everyone so over 50 mobile carriers to offer free access to the site, without any data fees.