How do I enable voicemail on my iPhone?
Head into your Phone app and hold down 1. This will take you into your voicemail setup where you will be asked for a voicemail PIN
Enter the default PIN: 111111 OR the last 4 digits of your phone number.
Once you are in your voicemail you will have the option to reset the PIN.
Once you have set up voicemail you will have access to Visual Voicemail in the Phone app.
If prompted for a 7 digit passcode enter the last 7 digits of your phone number.