I picked up the robocall blocking project again about a year ago.
I was crashing at my grandma's house a few days a week, and her phone would constantly be going off. It drove her crazy. So I decided to set her up with a Banana Phone.
She loved it. No more robots, just her cute old lady friends calling to schedule Bunco games or sick quilting sessions.
But I overlooked one key usability feature. She didn't have voicemail.
Naturally, this wasn't gonna fly, so I added in voicemail to her Banana Phone installation. In my eagerness to publish, I forgot to add that to the tutorial.
You can now find an added section to the Banana Phone tutorial about voicemail configuration.