Sorry to keep nothing you. I keep coming across things. Does the theme have any scrolling modifications because on iPhone it doesn't scroll as normal eg I can't flick the screen for it to keep scrolling as soon a I let my finger off the screen it stops. Also users can scroll past ads or disqus unless the scroll from an area no that above or below it.
Theme doesn't have any scroll modification, but maybe, this may help you http://stackoverflow.com/questions/18163568/native-like-momentum-scrolling-on-body-in-ios-webapp
Add that CSS into styles.css but it also depends of your devices (if it is reading this CSS 3 feature)