Step 1: Make sure your iPhone is jailbroken and detected by the launched iOS 9 data recovery software. Choose the Recovery Mode.
Step2. When the scanning is finished, select categories and view files according to your own needs.
Step3. Tick "Voicemail" in the program and preview the scanning results. Select the files and hit "Recover" button to save them on your computer. http://www.mobikin.com/doctor-for-ios/