Vodafone has introduced new tariffs on its Word Calling Card 110 and World Calling Card 550 to make ISD calling even more affordable for its prepaid customers in Kolkata. Priced at Rs 110, World calling Card110 comes with a validity of 30 days and allows customers to make all calls to Bangladesh at 5 paise per second. While the World Calling Card 550, priced at Rs 550, comes with a validity of 90 days and allows customers to make all calls to USA and Canada at 5 paise per second.This offer on World calling card 110 & World calling card 550 is valid upto 31st July, 2010.