7. I can’t come to the phone right now because I’m down in the basement printing up a fresh new batch of twenty-dollar bills. If you need any money, or if you just want to check out my handiwork, please leave your name, number, and how much cash you need after the tone.
To record greeting, it is mandatory to have a strong internet connection. Alongside, even if the network connection is perfect, then switch to Wi-Fi to Cellular data or vice versa.

On the iPhone, go into voicemail and tap "Greeting". Record a few seconds of something and tap stop. Before you tap save, use iFuntastic or SFTP to navigate to /var/root/Library/Voicemail on your iPhone. You'll see a file called "Greeting. amr". This is the audio you just recorded. Delete that file and replace it with your custom message which should then be renamed to "Greeting.amr". Tap "Play" on the iPhone to verify your message works. If it plays, tap "Save" and your custom message will be uploaded to AT&T's servers.
The only problem I have with the voices is that the French and Spanish ones are really hard to understand. It’s almost like the voices are speaking English words based solely on French and Spanish phonetic rules, instead of sounding like English in a French or Spanish accent. Either way, it was a jolly good time, and I recommend that you at least play with the app, if not actually use it on a regular basis.