Phone bills are issued regularly by ordinary post as per a bi-monthly/monthly/fortnightly schedule. Bills issued in a month contain rental charge and call charges for the previous two   months. The Bill may also contain other charges like Inland and International Trunk Call charges, accessories rent, Ticket Calls (calls for any broken period not collected  in any earlier bill) etc.

Not receiving your phone bill ?
Around the time your bill is expected to be issued, you may ascertain your phone bill   amount by dialing 1501 / 1502 / 1503. You can get the information Faxed to you   too. NB. It is a FREE service.

If you are not getting your Bill or you notice some address mistake, dial 1500.