[Vince]

Interesting that there's an "I don't know option" for OS - which conveniently also doesn't include Windows Phone - but there isn't one for screen size. I actual had to take a ruler and measure it. Some people just want a cheap smartphone and they could care less about screen size.

In any case, neither of these factors should contribute to the result at all; a website just needs to work in any browser and in any screen size.