Bsnl recently launched unlimited 3G pack of Rs.1099 in response to Jio Preview offer of unlimited 4G for 3 months.
Now the real price of this pack is Rs.1099 however you can activate these pack also via sms code from main balance and “more than full talktime offers” that Bsnl launches from time to time. We’ll help you utilize these offers to get the benefits.
Remember to get this effective price one need to have Bsnl more than full talktime offer valid in his circle at that time. 
Steps to get this Rs.1099 offer in Rs.861
1.) Topup Rs.1100 and get Rs.1200 core talktime (please check the prevalent in your circle) which is effective discount of 8.33 percent on value.
2.) Activate the Rs.1099 by sending sms code ACT DSTV1099 to SMS TO 51505(exact code may vary).
You would be charged 15 percent(service tax) less means only Rs.934.15 would be deducted from your main balance.
Now this Rs.934.15 deducted from account is further discounted by 8.3 percent because you got this balance on 8.33%
So effective amount one pays using this method for 1 month unlimited 3G pack is Rs.856.33.