Reliance, one of India’s biggest telecommunications companies, and Facebook, the world’s largest social network, just announced the launch of a new Facebook mobile app that is optimized to use as little data as possible.

The new Facebook app for Java-powered feature phones will be made available for most of the popular handset models and will be exclusively available to Reliance subscribers in the country. The telecommunications company will also provide a special promotional offer where all users can enjoy the app free for three months without incurring any data charges.

The new app is more evidence of Facebook’s interest in one of the world’s fastest growing wireless market, with 752 Million mobile phone subscribers as of February, 2011. According to Social Bakers, India is the 6th largest country on Facebook with 22 million users.

“We are always looking to work with innovative operators on ways to enable people to easily access Facebook wherever they are,” said Henri Moissinac, Head of Mobile Business, Facebook.

The app will be available for Reliance Communications customers to download without incurring any data charges from RWorld on their Reliance phones by visiting  http://wap.rworld.co.in.