For those curious about how this is done (don't try to use this for ill - it's seriously illegal and almost everyone gets caught): Generally you can access the

For those curious about how this is done (don't try to use this for ill - it's seriously illegal and almost everyone gets caught): Generally you can access the voicemail menu by entering star then a four digit PIN number while listening to any phone's voicemail. A lot of people leave their PIN as the default (star+1234 on some carriers, star+9999 on others). You can call their phone, get voicemail, guess the pin, and change any of their voicemail settings you like. It's even easier if you spoof the call as calling from the person's own number. This is a breach of privacy, but generally harmless. It gets dangerous when you start changing the message to something like "accept" and using someone else's voicemail to call collect, verify identities, etc. Again, this post is for curiosity sake only - do not try this.