Let's face it, the iPhone look is really gorgeous...
If you have a Domino R8.0.2 server and you have updated your mailbox to the latest template (mail8.ntf), you can see the nice DWA/iNotes ultralight edition, especially suited for the iPhone (link)
I don't have an iPhone, so I used Firefox browser and the User-Agent switcher add-on (link) to be a fake Opera browser... ;-)
I could see this web page:
Therefore I could see the url to open your mailbox, ultralite version style...
Today I'm too tired to RTFM... ;-)