Please Note: This guide is designed for Australian variant Galaxy devices, if you have an international device and require further support click here to reach out to your Samsung Subsidiary. Screenshots were captured from a Galaxy Note10+ 5G operating on Android OS Version 9.0 (Pie), settings and steps may vary depending on your Galaxy device and Android OS Version.
Voicemail messages left on your mobile are automatically saved in your Visual Voicemail. If you wish to delete a voicemail message, simply tap the Delete button. The message will be placed in the Deleted Messages folder, but will not be deleted from your voicemail (you can restore these messages later). To permanently delete messages, go to the Deleted Messages folder and select Clear All.

Thank you, US Mobile team. I had issues with voice mail on my new phone and you persisted until we finally got it resolved. It turned out to be erroneous numbers in the “Call Forwarding” settings. You were courteous and called me to work on it when that became more efficient than our emailing. Very good service.
The default voicemail greeting on the iPhone plays generic Your call has been forward to an automated voice message system recording. If you use your phone for work, create a personalized greeting that tells people you're a professional. If your phone is for personal use, create a personalized greeting so people hear your voice and know they called the right number.