How to lock the direct long distance dialing of your PLDT phone
Take note that before you do this make sure your phone is set to “Tone mode” (By default all phones are set to tone mode)
1.) Press *85* and your present 4-digit code then press * and your new desired 4-digit code then press #
Wait for the confirmation message or tone to know if your instruction has been accepted
Note: The Initial 4 digit code is 1234.
2.) To lock: press *54* and your 4-digit code then press #
3.) To unlock: press #54* and your 4-digit code then press #
If you encounter problems call 171 for assistance.
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thanks for the info.