Now enjoy free BSNL to BSNL calls in Gujarat Telecom circle. BSNL has announced new Special Tariff Voucher for its 2G and 3G Prepaid subscribers. The Voucher comes with a validity of 30 days for a price of Rs. 300. So, if you are a BSNL user with lots of your contacts using BSNL, this STV is for you.