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All 1800 811 822 33 44 55 66 77 88 99 are free dial as @KAPABLE-K your minutes counts towards if your are not on an unlimited minutes plan.
.. if you are on limited minutes plan during weekdays after 5 or (7 pm?) and during weekends your minutes don't run so completely free.
Toll free numbers are free to call, if your plan is not unlimited and you have a set amount of minutes then minutes will be deducted from your monthly minutes. If you go over your monthly minutes then you will be charged for overage according to your plan.