I know this is supposedly not possible, but I need to retrieve a specific voicemail from my iPhone which was also "cleared" from the Deleted Messages box. Any suggestions?

I know this is supposedly not possible, but I need to retrieve a specific voicemail from my iPhone which was also "cleared" from the Deleted Messages box. Any suggestions?

This is highly important. I know the number from which the voicemail arrived, but have not been able to figure out how to retrieve it. I accidentally had the voicemail in the Deleted Messages folder, and then Cleared this folder. If there is any possible way I might be able to retrieve this message, even if there is a cost associated with it, please help me.

Thank you.