I still get the same issue. I called my voicemail. It's set up and I was able to change my voicemail like that and listen to my messages, but the visual voicemail on my iPhone doesn't show any messages and will not allow me to create a new voicemail like it use to. Every time I click save it says "Greeting save failed. Failed to save your greeting"
Android phones can access voicemail by holding down the 1 key on the dial pad until the phone dials your 10-digit phone number. You will automatically connect to your mailbox and be prompted to enter your temporary password; this password is the last 4 digits of your phone number followed by the # key. Start the Google Voice app. Tap the three horizontal lines at the top left of the screen (sometimes called a hamburger menu), and then tap “Settings.” In the Voicemail section, tap “Voicemail greeting.” Tap “Record a greeting.” How do I access my voicemail? To call your voicemail on an Android phone, simply open your phone’s dial pad and hold your finger down on the “1” key. You can also call your voicemail from a different phone by calling your own number and tapping the pound key. How do you check your voicemail?

Navigate to your Phone app located at the bottom of your iPhone home screen. Tap-open the Phone app. Once you have done that, you will see a voicemail logo the bottom right corner of the window that has opened, select that voicemail icon. That action will open the visual voicemail interface. At first, all you will see is a blank screen with a
2. If you don't have a Voicemail app on your phone, or you aren't sure how to find it, you can still set up your voicemail using the Phone app. Tap on the Phone app to open it.