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 # |