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The Essential Phone List

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The Essential Phone List -- Dynamic Locking Instructions

Dynamic Locking for Landline Phones

Dynamic locking facilities for landline are not really necessary with current telecom tariffs. However, if you like, you can use the dynamic lock to reduce chances of misuse of your phone. If you don’t have dynamic lock facilities, request the telephone company to provide them to you. Disclaimer: The procedures described below used to work when we last tested them, several years ago. They may not work now!

BSNL

These instructions apply to most BSNL landline phone exchanges in the Pondicherry area. In the following notes, xxxx refers to your personal 4-digit secret code that you initially select.

Initially assigning your secret code

When you first get dynamic lock facilities, you have to assign your secret number (xxxx) to your phone. Do this by dialling 123-xxxx-xxxx. Wait for the acceptance tone (one-second beeps every five seconds) before hanging up.

Locking your phone to prevent outstation calls

Dial 124-xxxx-2 (where xxxx is your secret code) to lock all outstation calls. Wait for the acceptance tone (one-second beeps every five seconds) before hanging up. This sequence locks all calls except those to local landline numbers. It also locks special services, i.e., most local numbers starting with the digit 1, including Internet dial-up numbers (172xxx) and trunk-call bookings (180).


Unlocking your phone prior to making outstation calls

Dial 124-xxxx-3 for phones that do not have ISD (International dialling facility)

or

Dial 124-xxxx-0 for phones that have ISD.

Summary of locking and unlocking commands

x
x
International (ISD)
National (STD)
95-prefix numbers, special services (most numbers starting with 1), WLL-M numbers (Tarang), mobile numbers
Local landline calls
124-xxxx-0
Open
Open
Open
Open
124-xxxx-1
Locked
Locked
Open
Open
124-xxxx-2
Locked
Locked
Locked
Open
124-xxxx-3
Locked
Open
Open
Open
124-xxxx-4
Locked
Locked
Locked
Locked

Changing your secret code

Dial 123-xxxx-yyyy where xxxx is your existing code and yyyy the new code. Wait for the acceptance tone before hanging up. Now yyyy is your new code.

Acceptance tone

An acceptance tone (one-second beeps every five seconds) indicates successful imple-mentation of the dynamic lock command. A busy tone (repeated beep-beep) indicates that you have dialled the wrong secret code.

Using the incorrect secret code

If nine consecutive attempts are made to lock or unlock the dynamic lock with the wrong code, the STD/ISD facility gets barred; it will then not unlock/lock even with the correct code. You will have to make a written request to the telephone company to get the facility restored. After checking your signature with the one on the original phone application, your phone's STD/ISD facility will be restored.

 

Airtel

The following instructions apply to Airtel landline phones.

To set/change your secret code:

Dial 123-xxxx-yyyy where xxxx is your old code and yyyy the new code. The default code is 1234 if you are setting your code for the first time. Note that your code cannot be 1234.

To lock:

Dial 124 followed by your 4 digit code and then dial the appropriate locking digit from the table below. For example, to lock STD/ISD calls, dial 124-xxxx-1.

xLocking Digit
Status
0
Release all locks. All calls allowed.
1
Outgoing STD and ISD calls are blocked.
2
Outgoing STD, ISD, 95, mobile and WLL calls are blocked.
3
Outgoing ISD calls are blocked.
4
All outgoing calls are blocked.
7
Outgoing STD, ISD and 95 calls are blocked.
8
Outgoing STD, ISD, 95 and ISP calls are blocked.

To unlock fully:

As can be seen from the table above, to unblock and allow all outgoing calls, dial: 124-xxxx-0.

For Airtel Centrex (CUG) users:

If you are part of a virtual-CUG service being provided by Airtel, the format changes to:

Set/change secret code: *23*-xxxx-yyyy-#
To lock/unlock: *24*-xxxx-L-# where L is the locking digit in the table above.

 

This page last updated: November 25, 2011.