Lock BSNL Landline from Local / STD / ISD / All Outgoing Calls

For 100% protection against improper use, you can lock your telephone electronically. Here, you only know the secret code. You can lock/allow Local, STD or ISD calls in many way viz. all calls allowed, only local calls allowed, only STD & Local calls allowed, all outgoing calls barred etc. Register Secret Code Suppose you want to make 5555 your secret code.

Follow this procedure to register this:

  • Dial 123 5555 5555 then wait for the acceptance tone then disconnect.
  • Your code is registered.
  • Change secret code ¬†(Suppose you want to change current code 5555 to 4444 then Dial 123 5555 4444 then wait for the acceptance tone then disconnect. Your new code(4444) is registered. )
  • Bar/Open Facilities using Secret Code(example 5555)
  • Bar STD/ISD calls Dial 124 5555 1 then wait for the acceptance tone then disconnect. Now STD/ISD calls will be barred .
  • Open STD/ISD calls Dial 124 5555 0 then wait for the acceptance tone then disconnect. Now STD/ISD calls can be made.
  • Open STD calls only Dial 124 5555 3 then wait for the acceptance tone then disconnect. Now STD calls can be made.
  • Bar STD/ISD/manual trunck calls Dial 124 5555 2 then wait for the acceptance tone then disconnect. Now STD/ISD/manual trunck calls will be barred . (It will also bar calls to 95 level).
  • Bar local calls Dial 124 5555 4 then wait for the acceptance tone then disconnect. Now localcalls will be barred .(applicable only if STD Facility is available).
  • Open local calls only Dial 124 5555 1 or 2 then wait for the acceptance tone then disconnect. Now Local calls can be made. [source]

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