I don't know about iOS, but visual voicemail definately works on my S8+. On Android you use Xfinity's "Voicemail" app. I assume it would be the same on iOS....
Android and iOS voicemail systems are different. They have to be setup in the backend different. I'm wondering if anyone was able to do this since BYOD is not supported.
zzzrawr, we do not support devices acquired outside of XFINITY Mobile. I recommend you use the device you purchase from XFINITY mobile to ensure you are able to use the device fully.
Aside from that, visual voicemail in iOS devices are reached by going into the phone app and then tapping the lower right side of your screen that says voicemail.