The default voicemail has 15 voicemail storage capacity. You can buy enhanced voicemail with 100 voicemail storage capacity and transcription services for $4.99/month. If you want to disable voicemail completely, simple set the limit to 0.
Login: Go to the web page https://my.iplum.com on your computer or a tablet.
Accounts || Select Line || Manage Plans || Voicemail Plan Click Add/Edit. Change to 0, 15 or 100 voicemail storage. The enhanced voicemail plan for $4.99/month has 100 voicemail storage capacity and transcriptions. Click Update and complete the process.