To revive its landline business, BSNL has announced unlimited free calling scheme during night-hours on landline phones from 1st May. In a statement, BSNL said, the scheme will allow to make calls free of cost to any operator, including mobile phones, anywhere in the country between 9 PM and 7 AM and covers all types of connections. BSNL Chairman and Managing Director Anupam Shrivastava said company is modernising its landline business and want to resurrect it. Shrivastava said, there is no end date fixed for this scheme and Company will review it after six months.All major landline general plans of rural and urban areas, landline special as well as all major combo, landline with broadband, ones are part of the package. According to the latest TRAI data, BSNL, which dominates the landline space, was the biggest loser of fixed-line customers in February whereas Airtel emerged as the top gainer.