Kellyjahnene Said:
"Voicemail mail not working on my iPhone 13 Pro Max: [...]I have factory restarted the phone, I have carrier restarted and still nothing."
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Don't see the Voicemail App?...
Relocating Builtin Apps:
Two things to try...
A. Swiping Finger:
Swipe you finger down from the top-right corner of the screen towards the bottom-center. then, drag these items to the Home Screen.
B. Reset the Home Screen Layout:
If widgets are not working as they should or have gone missing somehow, then you need to reset the Home Screen Layout...
Go Here: Move and Organize Apps on iPhone - Apple Support
You'd have to add back all the widgets that you can recall being back on there. So, write down what is currently on the Home Screen.
Scroll to: Reset the Home Screen and Apps to their Original Layout
- Go to: Settings
- Tap: General
- Tap: Reset
- Tap: Reset Home Screen Layout
- Then... Add the apps back