[marktd]

This is my concern as well - if I want to use Org Mode for everything, including "random thing that just occurred to me that I need to do," then what do I do if "random thing that just occurred to me that I need to do" occurs to me while I'm on my phone, not my computer? I want one unified way to organize my TODOs, and it seems like org-mode isn't great for that.

[TeMPOraL]

There's a mobile app you can use to note stuff down straight to an org-mode file and then sync it up via Dropbox. Otherwise, I'd note it down in whatever other app you have. If you're following any kind of productivity methodology like GTD, you'll probably have a time in which you can simply retype your notes from your mobile to your org-mode system.