Yet another 1-800 data service (see also AT&T/Verizon, Vimpelcom, Facebook).
Read the terms carefully!
Airtel is "Presenting Free Zone powered by Google, an innovative service that allows you to access Google mobile services on the go at absolutely no data costs! Now with your internet-enabled mobile on the airtel network you can: Search on Google and browse the internet for FREE Send and read emails on Gmail for FREE Stay connected with your friends on Google+ for FREE"
"The free data usage on Free Zone is available up to a limit of 1GB per month .. you don’t need a data plan to use Free Zone as it is free of charge .. If you click on a link that takes you outside Google+ or Gmail or if you want to view an email attachment, you will need to pay data charges. Before you are charged, you will see a notification page, you can purchase a data plan or you can proceed further with the default pay-as-you use data charges .. When you click on a link in the search results page, you don’t pay anything. The first page(s) linking from Google Search are free, for pages thereafter you will need to pay for data usage".
"Can I use Free Zone on my computer or tablet? No, you can only use Free Zone on internet-enabled mobile phones"