PinchMedia who provides the analytics for the application breaks down customer usage including what specific devices are being used. This list of devices is reported to developers using internal device identification numbers assigned by Apple. In this case, "iPhone3,1" was first spotted in Pandav's usage logs in November.

The developer of iBart (a transit application for San Francisco) had apparently a very nice surprise today. While consulting his Pinchmedia report he discovered that his app has been installed and used on an device that identifies itself as "iPhone 3.1" :The latest iPhone, the 3GS identifies itself as "iPhone 2.1" so apparently the new iPhone model would be undergoing real life tests in the San Francisco area. All of this is not really surprising actually, the 3GS model was also first spotted online around november 2008 and we already saw references to the new model in Apple's iPhone firmware. I'm personally hoping that it will feature a shaver and the latest ARM dual-core processors... you? [Update] One of our commenters (Who would apparently be Saurik, Cydia's creator) is pointing out an interesting fact : It is actually possible to "fake" your device identifier by jailbreaking your iPhone and changing the system files. Also, don't get excited about the picture, it's a fake of course. Would this just be a hoax? [via Macrumors