[jacquesm]

I can't even read a phone screen without reading glasses on, I absolutely loathe reading more than a paragraph of text on one and I really couldn't imagine getting any significant amount of work done on a mobile platform.

If we count tablets as mobile too (they're wireless after all and plenty of them come with SIM slots) then the consumption part gets a bit better, in landscape mode you can read PDFs on them but the part of work that requires significant input would - for me - not be an option.