Yes! Music Teacher's Helper has a native iPhone app which you can download from the iTunes store at:
We also have a mobile app that works on iPhone, Android, Blackberry, and other smart phones with webkit-enabled browsers. We will be working on a native Android app in the near future.
To access the mobile app, open up your cell phone browser and go to: http://www.musicteachershelper.com/mobile
These apps allow you to quickly access important information on your Music Teacher’s Helper account through your mobile phone.