From Decipher Media:
Decipher VoiceMail will make you never lose important messages again. Quickly load messages from your iTunes backup. Listen to messages or export files for emailing or other uses. Easily see messages by names in your iPhone contacts. Requires iPhone Visual Voicemail.
What's new in this version:
Updates to be compatible with iOS 10!
Includes iOS 10 text message transcript text when available.