Combo plans = You get some plan on BB + some plan (free call, reduced call rate) on LL
Non-Combo Plans = You get some plan on BB + Normal charges on LL (i.e. if any calls made)
There is a plan which have no monthly rental and general call charges. So if you make any call you'll be charged else there'll be no charge. I forgot the name of the plan, generally peoples opt for that.
BTW, it's BSNL, so make sure to lock your phone with password, else BSNL peoples hooks up and you'll get bill of 1000 of rupees.
Ok got it, it's Sulabh plan. There are various Sulabh plans like Sulabh 1, Sulabh 2 etc. I guess it was Sulabh 2. Better check with your exchange.
And refer to
www.bsnl.co.in for plans and tarrifs on your circle.
Ok, as we said,
Source : Calcutta Telephones