Pandav, an iPhone development company, has noticed that an unreleased iPhone model has been using one of their apps, according to their app’s analytics. The app, iBART, is a public transportation guide for the San Francisco train system, and uses PinchMedia for usage statistics and other analytics. PinchMedia works by breaking down customer app usage and what specific device models are being used, and this is how the unreleased iPhone was spotted. “iPhone 3,1,” an unreleased iPhone model as the current 3GS model is known as iPhone 2,1, showed up in Pandav’s usage logs this month.

References to the unreleased “iPhone3,1” were first found back in August in iPhone firmware files, but this is the first time that evidence that the next generation iPhone (or at least a prototype) has already been created. A similar situation occurred last year, as Apple had also began testing the iPhone 3GS in October of 2008. Also, just like last year, the testing had likely taken place and was focused in the San Francisco Bay Area, close to where Apple’s headquarters is located.