Retrieve a deleted voicemail

Voicemail is a service provided by your cellular voice provider. I suggest you check with them if they offer this capability as each provider is different.

However, you can still try the following steps:

1. Tap on Settings > Phone > Voicemail
2. Scroll down to see the "Deleted Messages" option. Tap it and find the deleted voicemails. Note: If the voicemail you need to recover is not listed, you will need to contact your cellular provider for further assistance.
3. Select the voicemail(s) you want to recover, and then, tap on the "Undelete" button to retrieve the messages

Like I said, voicemail service may be different with each provider. In this case, you should contact yours for further assistance with this matter.