If you can't set up Visual Voicemail, contact your carrier to make sure that your plan supports the feature.
Website: https://www.online-tech-tips.com/smartphones/voicemail-not-working-on-android-a-troubleshooting-guide/
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Tap the three dots (upper right corner of screen)Tap “settings”Tap “voicemail”Tap “advanced settings”Tap “setup.Tap “voicemail number.Enter your 10-digit phone number and Tap “OK.Tap the home key to return to the main menu.
Website: https://support.8x8.com/express/devices/voip-phones-headsets/8x8-express-how-to-create-or-change-outgoing-voicemail-message
Website: https://www.republicworld.com/technology-news/mobile/how-to-set-up-voicemail-on-android-learn-to-change-your-voicemail.html
To access voicemail from another line, call the phone number, let it ring till it goes to VM, then interrupt the greeting by pressing * and entering the PIN. You can also call 8056377243 > press * > enter 10 digit phone number > enter PIN to access your voicemail.
The service also recommends stating your name, apologizing for missing the call and that you will call them back. If possible include a time frame for a return call. Don’t ramble or include un-needed information.
Because each carrier is distinct, please let us know if these processes are different for you in the comments section. Checking the Phone if there’s an ERROR on Voicemail Check it out on your phone (If No Data or Wi-Fi Connection is Available)
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Website: https://support.youmail.com/hc/en-us/articles/204255983-Assign-or-Change-Greetings-on-an-iPhone
Website: https://support.digium.com/community/s/article/How-do-I-record-my-Voicemail-Greeting-over-the-Phone
Disclaimer: Some pages on this site may include an affiliate link. This does not effect our editorial in any way. Set up Visual Voicemail on your iPhone
3. AT&T Voicemail Viewer. In case you still have a landline phone with voice mail function, AT&T Voicemail Viewer will help you even remotely track calls and messages.
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9. Make sure Call Forwarding is off. If you have a call forwarding set up, it is likely to cause conflicts with voicemail. To turn off Call Forwarding or make sure it is not enabled
source: How do i change my greeting for my voicemail messages on my assurance wireless cell phone? ahammad1996 Level 1 (Contributor)