Now that the iPhone 3.o software has hit developers, quite a few secrets are starting to leak out. To start out, it lifts the 10MB ban on podcasts in the iTunes Mobile Store, and Macrumors and ArsTechnica found this in the Dev Update:
The file, /System/Library/AppleUSBDevice/USBDeviceConfiguration.plist, lists details about the USB configuration of the various iPhone and iPod touch models, as well as the device ID and product names. The same file in iPhone OS 2.2.1 lists the original iPhone, iPhone 3G, and first- and second-gen iPod touches, referred to as iPhone1,1; iPhone1,2; iPod1,1; and iPod2,1 respectively. It also lists an unknown iPhone model, labelled iPhone2,1, which starting turning up in web server logs as far back as October 2008.
In addition to these references, USBDeviceConfiguration.plist in iPhone OS 3.0 beta contains references to iPhone3,1; iPod3,1; iFPGA; and iProd0,1. All of the products are assigned unique productID numbers, though all are assigned a productString of iPhone. These details are reported to Mac OS X when the devices are plugged in via USB, and would show up in System Profiler, for instance.”