Congress MP Pramod Tiwari on Friday said the scheme of giving smartphones at Rs.251 was the "biggest scam of the millennium" during the BJP regime.He demanded the money which had been received by the company should be kept secure.Tiwari said in the Rajya Sabha that the government needs to clear the facts about the "fraudulent 'Freedom 251' phones". Ringing Bells had launched "Freedom 251" smartphone that, it said, has been developed "with immense support" from the government.Ashok Chadha, the president of the company, had said the company will hand over 25 lakh "Freedom 251" phones to the people who have registered for it online.