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PLDT DDD Security Code allows you to lock or unlock your DDD thereby limiting instances of unauthorized long distance usage.

To use, simply lift the handset and:
To lock:	press 54 and your 4-digit code then press #
To unlock:	press #54* and your 4-digit code then press #
To change code:	press 85 and your present 4-digit code then press * and your new desired 4-digit code then press #

reminder:

Your initial code is 1234. We recommend that you change this immediately.
Wait for the confirmation message or tone to know if your instruction has been accepted.
Keep your code confidential.
Always lock your DDD after the call.
Your phone should be on “tone” mode.