Knowing how to recover deleted voicemail on iPhone can save you a lot of time. The first thing that should be done is to look at the Deleted Messages folder located in the Voicemail section of the Phone app. This folder is a temporary storage of deleted voicemails, which may be permanently deleted after a specified duration. In case the message is not present there, it can be saved with the help of the iCloud or iTunes backup made before deleting it. iPhone data recovery software can also be applicable in searching and retrieving voicemail files that have been deleted in a system where there is no backup.