For my home phone, I use freephoneline.ca. For voicemail, there are a couple of useful features, in addition to dialing in and checking voicemail the old fashion way. It would be awesome if PM can add these features:
1. As part of the self-serve system, have a page where you can check your voicemail. That page would list all of the voicemails saved and would allow you to download the sound file.
2. You can also choose to have the system send you the sound file to your designated email. That way, you can just check your email and play the voicemail from there.