I am unable to get mobile timing to work in iOS. When I click it to load the page it loads the header but just sits with the loading text and never changes. This happens in both Safari and in Opera Mini. I will try it in another mobile browser tomorrow and see if that changes anything.
@Jason which iOS device are you using? I was able to see mobile timing with my iPad (3d gen, iOS 5.1.1) using the Chrome browser. I never tried it on an iPhone/Touch device.