BB249 promotional plan was introduced in September, 2016 for a period of only six months to counter Jio and Airtel. But it's popularity soared pretty high and BSNL has been extending the period since then. The last extension of this plan was up to 31-03-2018. But according to the BSNL Calcutta telephones site (http://www.calcuttatelephones.com/bsnloffer/bsnloffer_promotions.shtml#BB), the plan period has received yet another extension up to 30-06-2018. It's been a honeymoon period for current BB249 subscribers who have been enjoying additional Happy Browsing offers since June, 2017 and Minimum 8 MBPS speeds since November, 2017!