Not all carriers support Visual Voicemail, but most major ones do. Visual Voicemail will work automatically as long as you’ve set up regular voicemail on your iPhone. Tap the Phone app icon to open it.In the bottom toolbar of the Phone app, tap the Voicemail icon.On the voicemail screen, you’ll see a list of all the voicemails people have left you. Tap any voicemail on the list.When you tap a voicemail on the list, it will expand to show a set of controls as well as the iOS transcription of the voicemail. If you want to read the transcription without hearing the voicemail, you can do that right here. Alternately, you can tap the play button to hear the voicemail. Save And Share Voicemails
Rehearse or write down your message before recording it. Remember that old saying “practice makes perfect?” It’s certainly true when it comes to creating an electronic greeting. The more you’ve rehearsed, the easier the message will be to restate. If you don’t have time to practice, writing down the greeting before recording it – and then reading it aloud from the paper – may help you stay focused on the correct wording.

One cool iOS feature is called Visual Voicemail. This is Apple’s attempt to make voicemail less annoying. Visual Voicemail allows you to see a transcription of the voicemail the caller left. This transcription allows you to read their voicemail as if it were a text message.
Navigate to Settings → General → Reset → Reset Network Settings → Enter your password → Reset Network Settings.