Now Airtel customer can wish Happy Diwali to their loved ones at very low cost as Airtel has come with New STD Hungama offer for WB, Kolkata and Orissa Circle. ‘STD Hungama plan’ Kolkata, West Bengal and Orissa Airtel consumers cam make STD calls at just 40 paisa per minute anywhere in India and for local calls charges are as low as 50paisa per minute. STD Hungama plan is just for Rs. 6 with 15 days validity. Both new prepaid and existing Airtel users can get this plan. STV value: Rs. 6Validity: 15 daysSTD call rate: 40p/minLocal call rate: 60p/min