The Cellular Operators Association of India, a body of GSM and CDMA mobile service providers, on Friday said that the Government should take steps to vacate the unused spectrum lying with various agencies under it."Nearly 450 MHz of spectrum in various bands are lying with 13 government agencies like Army, Navy, Airforce, border police, state police, AIR, DD and space", director-general of the Cellular Operators Association of India (COAI) Ranjan Mathews told reporters on the sidelines of a BCCI event here.