MacRumors reports that Apple have begun field testing their new version of iPhone, as “they’ve spotted usage records for an unreleased iPhone in their application analytics,” informed iPhone developer Pandav. The application named iBART – a public transportation guide for San Francisco train system was used. PinchMedia who provides analytics for app breaks down customer usage including what specific devices’re 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. This “iPhone3,1” identifier doesn’t match up with any shipping iPhones. Last iPhone released to public was iPhone 3GS which carries identification string “iPhone2,1”. References to “iPhone3,1” was first discovered in iPhone firmware files back in August, but this seems to be first time that it has been spotted “in the wild”. Apple similarly began testing iPhone 3GS (iPhone2,1) back in Oct 2008 about 8 months ahead of its launch.