Visual Voicemail for Xfinity Mobile
I actually have an answer rather than a question. I managed to get Visual Voice Mail activated on my iPhone 11 after switching from Verizon by calling Xfinity Mobile at 1-888-936-4968. After finally convincing the automated support system that I really needed to talk to an agent, I was able to contact one who got it activated in roughly 10 minutes.
iPhone 11