Locked out of my voicemail need to set my voicemail

VoiceMail (Visual or Normal) is a Carrier Specific feature. Contact your Carrier (Cellular Service Provider), the agency that issued the SIM / eSIM to you.

You need to contact your carrier’s tech support.

You have received two responses to your question and both have instructed you to contact your cellular carrier. Voicemail is a carrier feature and they are responsible for fixing any problems.