On Recharge with Rc.15 you will get Unlimited WhatsApp with 15 days Validity
On Recharge with Rc.30 you will get Unlimited WhatsApp validity is 30 days
All the mentioned pack can be activated by dialing USSD code *123#
For Rs.15 Unlimited WhatsApp, keyword is “CHATGPRS15”
For Rs.30 Unlimited WhatsApp, keyword is “MCPGPRS30”
In TATA DOCOMO there are unlimited WhatsApp Plans which is clearly mentioned in given image below.
WhatsApp plan is to use WhatsApp on your Mobile Device and these plans will not allow you any Internet Data Connectivity if even if you try to browse internet balance will be deducted as you have not subscribed to Internet Data plans and only you have subscribed to WhatsApp Plan, WhatsApp plan will allow only to use the WhatsApp Messenger on your Phone that’s it.
You can activate these WhatsApp Packs Online also by going to link http://www.tatadocomo.com/3g-prepay-packs.aspx#disTextdump