Gmail Mobile Missing "Report Spam" on the iPhone

I mentioned yesterday that the Gmail Mobile site was improved to expose more of the functionality you get in the full HTML version. I loved the Report Spam button, which you can use to quickly report all the checked messages as spam. But this morning, I notice that this button is gone:
But is seems to be only gone from the interface when you access it from the iPhone. Access the same site from a desktop browser (or another mobile browser), and you will get a slightly different UI with the Report Spam button:

So Gmail seems to be serving a different page for iPhone users. Nothing wrong with that, but please, provide at least the same amount of functionality in the pages you build for the iPhone as in the pages built for other devices!