You can.
After reading many a thread. I was able to record and save voicemail from the iPhone cheaply and efficiently. You will need Quicktime Pro or some other audio recording program that uses/accesses your Mac's standard input. And you will need a Stereo Headphone Cable, 1/8" Jack to 1/8" Jack. (Dual Male stereo mini jacks). Go to Radio Shack... $15.00 or less.
This works with the 3G iPhone (you will need a recessed headphone adaptor for the earlier iPhone).
Connect your phone to your computer via the iPhone headphone out to the Audio line in of your Mac.
If using Quicktime Pro, run the app, then:
Preferences>Recording>Microphone>Built-In Line Input: Line in.
In QT, File>New Audio Recording.
In your System Preferences, Sound>Input>Line In> Have "Audio Line-In port" highlighted.
iPhone-Play back your Voicemail.
Sound Menu-Adjust your input volume until you see your Input Level meter registering the sound. iPhone-Adjust your headphone output volume until you see the input Level meter in QT stay just below the red peak. Play it back and make sure on average it stays above 50% but does not go into the red.
"Rewind"/Reset your VM for playback.
Hit Record (Red Button) in QT.
Play VM.
Stop when finished.
QT will only name the file "Audio.mov" Use File>Save As and Rename the file and save it to an appropriate folder. Play back the file to make sure it's not distorted from to much gain on your input levels.
Lather, Rinse, Repeat.
That's how you do it. Much simpler than it sounds... I just really spelled it out for everyone.
Dear Apple... how about a tab in iTunes so you can save/access these files on your computer?
Or a way to email them to ourselves/someone else via the playback/delete screen in the iPhone?
What? No one at Apple wanted to save a voicemail before?
Loyal since OS 8.5
Dario NYC
www.dariobigi.com