Retrieving Old Voicemails
I need some old Voicemails for a court case. I deleted them almost a year ago thinking I didn't need them and well... here we are
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If you have a backup that is that old, they may be there. Note that restoring your phone to an old backup will overwrite everything currently on it so be sure you also have a current backup.
You can try contacting your carrier but I don't think they store them for more than a very short time after deletion (<30 days).