How to set up “voicemail password”
I never set up a password pin, and there’s no function in Settings > Phone that allow me to disable or change that.
iPhone 8 Plus, iOS 14
Question marked as
Carriers require you to setup a voicemail password in order to use their voicemail system.
The password is very commonly forgotten because it is used so rarely.
If you have forgotten the password or have never set one up, contact T-Mobile customer support.