After creating, the Voicemail Greeting, you can test it by calling to your number from another phone, and see if it is playing correctly or not. Open the Phone App. On the lower screen, tap on the Voicemail option. Select Custom, with this option, you can record the personal voicemail greeting on the iPhone. Tap Record, to start recording the voicemail greeting message on the iPhone. Greeting samples are given in this article below, Once you are done with recording, tap Play to listen. Lastly, if everything is alright, and custom voicemail recording is perfect, then tap Save.
Perhaps this guy was tired, maybe having a bad day, and hopefully he doesn’t leave this type of message regularly.

My wife and I can’t come to the phone right now, but if you’ll leave your name and number we’ll get back to you as soon as we’re finished.
“You’ve reached Bernice’s phone. I’m getting a tooth pulled on Tuesday and don’t feel like talking. In fact, I’ll probably sleep for about four days after the procedure. Tooth resorption is not a joke, friends. Ain’t nobody got time for that. Let your human brush your damn teeth, even if it feels like you’re about to DIE by way of tiny toothbrush. Also, I’ll be accepting gifts of gravy in the days following the extraction.”