Today I found and app that lets you use steemit on you iPhone. The app is called Esteem and it's free and is a small sized app so anyone can download it anytime.
So far my experience has been good some bugs have been worked out but it's almost and exact Copy of STEEMIT online. The app is great you can still see your wallet and comments/replies in the app.
I think this app will be great for the STEEM community once some bugs are worked out.