The Voicemail Line - 206-666-4463
The number spells out 206-66-OH GOD. At the end of each show, Tim will say the number followed by: "As in 'Oh God'..." he will then follow with either a clip from that day's show, or a statement related to one of the news stories he read that day.
Call the show's voicemail line and leave a message. It may be used in an episode. Tim has mentioned having 1,000 to 2,000 unplayed voicemails at any given time. Tim is usually backed up by a week or more for the voicemails he does play and won't remember what you're talking about.
It should be noted that when it is said that Tim is "backed up", it probably doesn't refer to the number of voicemail messages waiting.