What is the rest? I.e. how can one access this, which to me seems to be a site on the Web (a "web site", to many), other than "on the web"? I'm feeling my age, here. :|
If it makes you feel better I'm part of Generation Y and I'm not sure where else one would see a 404 besides on a "website".
Sometimes I go to my nightstand and my phone isn't there, "Four, Oh Four!" Other times I get there, but I hear from downstairs, "Three Oh Two, dear, it's down here on the coffee table." I run downstairs and grab it, relieved, "OK!"
I guess what I'm trying to say is that we couldn't fully implement this on mobile due to keyboard restrictions..