I'm using Orgzly. But to be honest my use case doesn't involve much use of org-mode on the phone. And I just a had more thorough look and it doesn't support a lot of important features, to the point I should probably retract that bulletpoint not be misleading:
- No codeblock support (execution not working is probably to be expected, but I would expect at least syntax highlighting, but it doesn't do that either)
