If you're listening to voicemail on one of these, it may be time to upgrade
So, let's say you want to leave a message for someone but don't want to talk to them. You can call Slydial's phone number (267-SLYDIAL, or (267-759-3425)), wait for it to connect, enter the phone number you want to leave voicemail for, and they'll connect you (after you listen to an ad).
Nice to have in your bag of tricks.
Slydial Web site
Link to article