State-owned BSNL has launched a promotional offer under which prepaid customers will get double the data on specific plans, on the occasion of Muharram and Dussera. Prepaid users can avail this double-data offer between October 10-31. Under this offer, Rs 1,498 will give 18 GB instead of 9 GB data, Rs 2,798 will give 36 GB instead of 18 GB, Rs 3,998 will give 60 GB data instead of 30 GB and Rs 4,498 will give 80 GB data instead of 40 GB data. The data packs are valid for 365 days.