Telecom Regulatory Authority of India (TRAI) has sought more information on the availability of 3G spectrum while proposing that vacant 3G slots be put up for upcoming auction along with the spectrum in 900 Megahertz (MHz) and 1,800 MHz bands. In a letter to the Department, the regulator said, it will not be in a position to go ahead with the consultation process in the absence of full information with regard to total availability of the spectrum in the 2,100 MHz 3G band and requested to indicate the decision regarding this at the earliest.Last week, the Department of Telecom had sought TRAI's recommendations on the reserve price for 2,100 MHz, 2,300 MHz and 2,500 MHz bands for all the service areas.The DoT has informed TRAI that at present no vacant spectrum is available with it in 2,100 MHz band and discussions with Defence are underway for release of one block of 5 MHz of spectrum.