The following are some of the tools available for BSNL customers at the time of writing this post. To know last bill amount Send BILL to 53333 To get usage amount Send AMT to 53333 Ring Back Tone Send BT ACT to 56700 to activate. This should be followed by BT song-code to 56700 Send BT DACT to 56700 to deactivate. Visit http://www.keralatelecom.com/teleNEWS/prbt1817.htm for more details. SMS Message Center For numbers starting with 9447 - +919440099997 For numbers starting with 9446, 9495 or 9496 - +919442099997 To activate Friends and Family Call Plan SMS the following to 53733 FFE Landline Number (including STD code) Mobile Number To know the EMI number of your handset Press *#06#