Google Analytics can tell you who’s visiting your site from iPhone

IPhone is so popular, even Google Analytics has included ‘visitors from iPhone’, as one of the filter on the Google Analytic’s Advance Segmentation.
So now you must be curious if you have visitors from iPhone. But first, you need to set the filter.
To do this, access Advance Segment from any report page. At the right top of the screen, you’ll see option such as above. Click the button next to ‘Advenced Segments:’
Menu such as below will appear on the screen. Scroll down little bit, and there is the filter. Apply the filter and you’ll get the graph such as below.

I only have 1 visit from iPhone so far. That is predictable considering I don’t have tonnes of traffic, and iPhone is luxury item here.
So when Android, WinMo, Palm Pre, S60 filters will come out?

isn’t it detectable by identifying user agent?
How about stats from blackberry and other smartphones?