With lots of providers you only need the PIN if accessing voicemail from a number that isn't your own, eg "dialling in" to your voicemail from a payphone/friendsphone/etc (dial your own number, press *)... if it detects it's from your own number, it generally just lets you in without the PIN.
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So all he had to do was spoof the number to access voicemail setup? That seems wrong. Would he not need the voicemail passcode as well?
With lots of providers you only need the PIN if accessing voicemail from a number that isn't your own, eg "dialling in" to your voicemail from a payphone/friendsphone/etc (dial your own number, press *)... if it detects it's from your own number, it generally just lets you in without the PIN.
No voicemail passcode was set. The skurt.co folk spoofed his number and set whatever voicemail passcode they chose.