The tab for visual voicemail wasn't there when I first opened the phone app. I dialed a voicemail phone number, and then after closing the phone app and reopening, the visual voicemail tab was there.
Yep, works for my mom...have them try again, make sure the LTE is on the plan...maybe try another phone like the 920, it will do visual voicemail...I had AT&T add my mom's phone as a 920 when she had a 520, and she had visual voicemail on that then