Technically all toll free numbers of BSNL are supposed to work from all BSNL phones including Mobiles..(both prepaid and post paid)... even I had this problem and opened a new thread regarding 1600, 1800 numbers.) Well as of now most of the 1600 and 1800 series numbers are toll free in Andhra Pradesh.. The rest like 1500 is suposed to be toll free from BSNL mobiles but its being billed.. I have been in touch with the"IN services" DE of my telecom circle (cellone/excel) for more than a month how and the update is they are going to fix this problem so that "All level 1 toll free numbers like 1600xxx, 1800xxx, 1500 are not billed when called from bsnl mobile). In Andhra Pradesh you dont need to have a minumum balance of 150/- to call toll free numbers. RAJAN can you please check if 1802233, 1802180, 1802345, 1602233, 1602180, 1602345 are toll free from chennai or not... Pleaes do this favour to me...Thanks a lot in advance.. Will update you when I hear back from the DE.