Go To Settings > Sounds & Haptics Or Settings > Sounds.
In the bottom toolbar of the phone app, tap the voicemail icon. You can change it whenever you like, though. Tap voicemail at the bottom of the screen.
If You Forgot Your Voicemail Password, Contact Your Wireless Carrier.
With a message selected, tap the delete button. Tap voicemail, then tap greeting. Select the voicemail tab, then select set up.
Now Tap On The Mark As Read Present In The Bottom Left Corner Of Your Screen.
If so, follow the voice prompts. Tap custom if you want to create your own custom greeting when someone reaches your voicemail box. When prompted, create a new passcode for your voicemail, then reenter it.
When You Tap A Voicemail On The List, It Will Expand To Show A Set Of Controls As Well.
For this, on your iphone open the phone app. Change the alert for new voicemail: Enter, then confirm a custom voicemail password.
Tap The Voicemail Tab At The Bottom Of The Screen.
Now select the unheard message or messages. On the next screen, type a password (minimum 4 digits) for your voicemail box, re. Create your password and set a greeting.