The service offers 3G voice and data plans. Head over to http://bsnl.co.in/newsdetailed.php?news_id=448 for tariffs and chages.
BSNL has put up a pretty good FAQ sheet to clarify your queries here: http://www.bsnl.in/faq/faqans.php?paramCategory=3G%20Mobile%20Services
In case you wish to register online for 3G service, you can do so here: http://portal.bsnl.in/bsnlccp/New3GuserReg.aspx
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