Yes, if you jailbreak your iPhone, install openssh, SSH to localhost and start your specially compiled emacs for arm binary. A bluetooth keyboard is recommended. If it's just about viewing you could export to html, or export to a file that another Outliner app can easily import.
The same method of operation (native emacs) on Android is much more convenient, by using a Linux chroot (Linux Deploy). Android users also have it much more easy in the org compatible App department, they can use Orgzly!
I'll go ahead and admit it: I still use an N900 just because of org-mode. I can't really recommend it to anyone else as it's not going to meet expectations of a modern smartphone, but I love it. That and git syncing with my desktop make it really effective for me.
The same method of operation (native emacs) on Android is much more convenient, by using a Linux chroot (Linux Deploy). Android users also have it much more easy in the org compatible App department, they can use Orgzly!