Yes! You can have your voice comments set to private by logging onto your Snapvine profile. Click "ACCOUNT" then select "PRIVACY SETTINGS". Check the box next to "Yes, screen my comments" and click "SUBMIT". In this menu, you can make your voice comments available to only your friends.
Your phone isn't linked to your account. All you have to do is log into your account and click the my moble link from there follow the given directions and validate your phone to the account by calling in. After youve done that your pic and name will show up after leaving every message.