On Android devices, your contact book (also called a "phone book") is the list that can be found by tapping the People icon on the home screen. You can easily add people who have sent you voicemail messages to this list from within the Visual Voicemail application.
1. From the Inbox, tap on the message whose sender you wish to add to your contact book. The message playback screen will appear.
2. Tap on the Add to Contacts image in the header of your message.
3. Tap Add new contact for a new entry to your phone book, or Add to existing contact to update an existing contact.
4. Select which account you want to add this contact to.
5. Enter information about this contact in your phone book as desired.
6. When you are finished, tap Save to save the contact information and return to message playback.