That has to be a troll post. No one in their sane mind would code on a phone when a keyboard is close by.

Like if you were flying or something sure I guess writing something in notepad then emailing it to yourself later...

But writing in bed? Please.

Good question but most note taking software on iOS doesn't have Vim bindings, so I take Vim on a server for note taking already. Then I can also get right into the actual code anyway.