These are the codes needed to open or close the national dialing directory (NDD) feature of a Philippine Long Distance Telephone (PLDT) line. I though I have posted it before here because I have some trouble in finding my codes. Before the PLDT yellow book directory included this but on the present yellow book it is nowhere to be found. So here it is:
Lock #54*----#
unlock*54*----#
Lock #54*----#
unlock*54*----#
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