Vodafone on Tuesday joined the per second billing race as it announced calls at 1paise per second for all local and STD calls for its new and existing customers in Kolkata.

In order to avail the offer, the subscribers would have to do one time recharge with a bonus card of Rs 63. The 1paisa per second rate is valid for one year for all calls made to any operator in India with a daily rental of 50 paise.