Much like Kamen Rider Build, Kamen Rider Zero-One's bike is created through his business phone, the Hiden Rise Phone. This device is shaped much like a Progrise Key, even though it's actually a giant phone that is summoned from his regular phone that then transforms into a bike. Kamen Rider is weird. The Hiden Rise Phone has sounds in both modes activated by a button. Yo Aruto, you got message!