To answer you title question, yes, Visible has visual voice mail. It is built into your phone but with an older phone it may not be available. Not sure if anyone will answer whether there is an app but try doing a Google search. Only thing I can suggest to do is look at your phone settings and see if you can find it. On my Motorola(Android) phone it can be found in the phone app, click settings, click voice mail and turn on visual voice mail. Not sure if it is the same on a Pixel.
