Gmail Priority Inbox which until now was an Android exclusive feature is now available on all the phones that have a HTML5 capable mobile browser.
So, if you have already setup your Priority Inbox on the desktop version of your Gmail account, you will now be able to see the Priority Inbox when you click on the “Menu” button the next time you visit gmail.com webapp on your phone’s Mobile Browser. Unfortunately, you cannot change the importance of the mail i.e mark the mail as important/unimportant from your phone yet. But I guess that will be rolled out in future iterations.
As stated earlier, Priority Inbox feature is available on all devices running on Android 1.5+, iOS 3.0+ or any mobile phone which has a HTML5 capable mobile browser.