All of the home games, and most ACC away games are just on the regular ESPN app, if you log in with your TV provider (and you get ACCNetwork in your package), you don't need ESPN+. But that works too if that's all you have.
The WVUM "Listen Live" just runs through the browser on your iPhone/iPad, but it can be hit or miss whether the play button works. Middle of the page you'll see the black bar with the Play button and volume slider.
www.wvum.org
I don't think there's any app for WVUM, so that's the only option.