To delete voicemail on an iPhone, follow these steps:
- Open the Phone app and tap the Voicemail tab at the bottom right.
- To delete individual voicemails, swipe left on the message and tap Delete, or tap the voicemail and then tap the trash icon.
- To delete multiple voicemails at once, tap Edit in the upper right corner, select the voicemails you want to delete, and then tap Delete.
- Deleted voicemails are moved to a "Deleted Messages" folder at the bottom of the voicemail list. To permanently delete them, scroll to this folder, tap it, then tap Clear All and confirm.
This process permanently removes the voicemails from your iPhone and they cannot be recovered afterward
