These steps are for all Devices including Windows, if voicemail is less than 30 days old. Go to My T-Mobile and log in to your account. Click My Phone or Line Details > Check Voicemail. Log into your Digits account. Click on the message to download. In the expanded menu, click Download.
If the problem is with your phone, the factory reset has a good chance of solving it. If not, contact your mobile service provider, to carry out some troubleshooting to help resolve the problem from their end.

If this does not successfully link you to your voicemail account, follow the steps outlined below. Press the three dots on your keyboard (upper right corner of the screen)Select “Settings” from the drop-down menu.Select “voicemail” from the drop-down menu.Select “Advanced settings” from the drop-down menu.“Setup” should be selected.Click on the “voicemail number” option.Enter your ten-digit phone number and press the “OK” button.To return to the main menu, press the home button. Obtaining Access to Your Twigby Voicemail from a Different Phone:
In many cases, an update to your carrier’s voicemail app or settings can resolve the issue, but don’t forget to call your voicemail number to check if it is set up correctly. Once you’ve set up your voicemail, you’re free to switch off when you need to. There are other ways you can stay in contact, however.