BSNL brings promotional offers to the month of December 2013. The following full talk value offer will be offered for a period of 90 days from 5.12.2013(ie 5/12/2013 to 4/3/2014) on the occasion of Christmas, New Year. You may also read: BSNL Standardising Keywords for STVs Full usage value equal to MRP for TopUp 550(Paper