The design of the Voicetools page is simply out-of-date. There's a term "mobile friendly" or "mobile responsive" to describe how a web page proportionally resizes and functions on mobile devices. Voicetools is designed for computer browsers.
It would take a redesign of the page to make it work better with phones, and Cox probably doesn't want to invest the money for limited use. Most people have a desktop or laptop. Have you considered buying one? You can get a Chromebook for 150-200$ and can get 100$ back from ACP.