[rokhayakebe]

You can use this trick to listen to anyone's voicemail (by identifying the calling number as the recipient's number) if they do not have a password. Anyone. Talk about security hole.

[getsat]

IIRC, this same flaw was used by Murdoch's papers to hack various celebrities'/deceased individuals' voicemails.

[brk]

It depends, many voicemail system require a PIN, especially after some of the recent exploits.

BTW, this is talking about SMS, not CID spoofing, so your comment wasn't exactly on topic.

[olihb]

This doesn't work on my cellphone's voicemail. I guess the new systems closed that hole.

[rokhayakebe]

I am not sure about that. I tried it as recently as 6 months ago.