BlackBerry Messenger users will be delighted to know that Airtel has launched an affordable BBM service plan for its postpaid customers. The new “BBM Plan” as it’s being called offers unlimited BlackBerry Messenger access for a month and 300 SMS for a month, at an affordable Rs. 129. The low pricing is sure to be a hit amongst those who've always wanted an affordable BBM service plan. Those using Airtel postpaid service can walk into the closest Airtel helpdesk to get this plan enabled on their phones or they can dial 121. BBM has been a popular instant messaging service that’s tightly integrated into all BlackBerry devices. In fact, it’s one of the reasons why BlackBerry devices are this popular..