I've yet to find a reasonable mobile version of org-mode. Which is, frankly, a non-starter for me personally. 90% of the time I am probably referencing something from my notes when mobile, but I need those notes to:
1. Be accessible an up to date
2. Easily searchable, and to do so quickly
3. In the rare case that I need to take a note, it is best if I can do so easily and have those go back to my computer quickly and painlessly so I can do what needs doing to get that into the system better.
Org-mode simply does not do this well in any of my experience with it. It's fine if all you're doing is taking notes on a computer, but as soon as you add a mobile device to the mix, it goes belly up for me.
