An investigation into Thailand's 3G licence auction has failed to find any evidence of collusion between the three operators that acquired the airwaves, reports Cellular News. Following the failure of the auction to sell the licenses for more than the reserve prices, there had been allegations that the three sole bidders for the three licenses had colluded to fix the prices. The Department of Special Investigation (DSI) and a probe committee led by the House secretary-general have now said that they were both unable to find any evidence to support the claims.