As for me coding on the phone was exactly the thing why I wanted to buy a smartphone in the first place (and why I've bought one equipped with a qwerty keyboard initially). But I've soon found out no reasonable mobile IDE exists. I would have be glad to code on my smartphone (now I have Galaxy Note which is reasonably big and I can attach an external keyboard) if only there was a good (like PyCharm) IDE. Autocompletion is especially important on a mobile and the only 2 [non-mobile] IDEs I know to have good autocompletion are IntelliJ Idea (and its derivatives like PyCharm) and Visual Studio.