On Android devices, your contact book (also called a "phone book") is the list that can be found by tapping the Contacts icon on the home screen. You can add people who have sent you voicemail messages to this list.
1. From the Home screen on your phone, open the Contact book.
2. Tap on the Save contact to image icon.
3. Add a new contact name.
4. Enter the sender's phone number.
5. Optional: Enter additional information about this person in the contact.
6. Tap Save to save the contact information.
7. Launch Visual Voicemail.
The sender's name will appear in the received message.