Vodafone has released East STD bonus pack for its prepaid customers in Chennai and Tamil Nadu. This offers lets you call your friends and relative in the Eastern parts of India at cheaper call rates.
In the East STD bonus pack, you could make land-line or mobile phone calls to states like West Bengal, Uttar Pradesh, Bihar and Orissa, from your Vodafone prepaid connection at 30paise/minute.
This pack costs Rs 28 with the validity of 30 days, and it could be activated by dialing *121*28# from your Vodafone prepaid connection.