There are so many hassles on the phone, that I almost never use TW for note-taking there. I do use it for note-reading (like literature), and for checklist apps (travel lists). But use something else if I want to write a note, since browsers on phones/tablets will use any excuse to reload or clear your page, which leads to work loss. You can use it for notes, but you need to be hyper-vigilant about saving before leaving the page.