What eventually worked is going into my deleted voicemails and pushing "Clear All".
Changing default voicemail to the custom greeting is very simple until iPhone won’t save custom voicemail greeting or custom voicemail greeting on iPhone not working issue arises. Don’t worry, you are not the only one with this problem, till now many users have fixed the unable to change voicemail greeting on iPhone with the help of below solutions.
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Website: https://www.xfinity.com/mobile/support/article/how-to-access-voicemail-android-phone
Website: https://forums.att.com/conversations/apple/iphone-8-and-voicemail-custom-greeting-not-working/5df01bbfbad5f2f606f690fd
6. Return to the dialer and enter the number from Step 6 (along with the *) once more.
4. Toggle Cellular Service on and off. You can turn off and then turn on Cellular Service from Settings or Control Center. Launch Settings → Cellular → Toggle off Cellular Data → After 30 seconds, toggle it back on.
Sending a Message. – Lift Handset. – Press Express Msg key or Feature 980. – Enter the mailbox number to send the message to. – To leave your message, press OK or 2. – Record your message at the tone. – To end recording, press OK or #. – To send your message, press SEND or #. Checking Voicemail from an Outside Line.
For personal users, a funny iPhone voicemail message may be just what you want. It’s still a good idea to keep it short, but you can have some fun by using your iPhone to record a funny voicemail message played over a speaker on your computer or another device.
Website: https://www.msn.com/en-us/news/technology/how-to-set-up-voicemail-on-your-android-phone/ar-BB1c3igC
To set up Visual Voicemail, tap Set Up Now. You’ll be prompted to enter and confirm a voicemail password. Next, you’ll have the option to choose the default voicemail greeting or record your own. If you want to record your own custom greeting, tap Custom. Once you’ve entered created your password and chosen your greeting, you’ll be able to receive voicemails and view them in the Phone app.
Website: https://www.phone.com/phone-support/features/how-do-i-set-up-my-voicemail/
Integrate or interconnect the Yeastar S-Series VoIP PBX with other devices or applications.
Auto Provisioning App helps you set up your IP phones and Yeastar TA VoIP gateways in bulk.
This is an Apple bug that has been there for YEARS, and they STILL refuse to address it!!!
Access to voicemail can also be obtained through the iPhone’s dial pad by pressing and holding down the 1 key until your phone calls your 10-digit phone number, or by pressing the voicemail icon, which can be found in the bottom right corner of the dial pad screen, as shown in the image below.
Verizon has become the ultimate network carrier out there and they have come up with plans to meet the diverse needs of the users. Similarly, there is a voicemail feature through which users will be able to access important messages if you couldn’t answer someone’s call.
With Visual Voicemail, you can see a list of your messages and choose which ones to listen to or delete. Learn how to set up and transfer your existing voicemail. Create a voicemail password, then tap Done. Enter your password again to confirm it, then tap Done. Select Custom or Default. If you choose Custom, you can record a new greeting. Go to the Phone app, then tap the Voicemail tab. Tap Set Up Now. Enter your password,* then tap done. Record a custom greeting or use the default greeting, then tap Save.