The Fujitsu-Toshiba IS12T handset, which is to be released this year in Japan, has been updated to RTM build (7720) of Windows Phone "Mango". Previously the device had been reporting 7716.WM7_Main as the OS and NA for name, model and carrier fields. If you glance at the photo above, you'll see "FujitsuToshibaMobileCommun IS12T" has populated the missing labels, with KDDI for carrier and "Windows Phone Mango RTM" for OS.

Source:, thanks tezawaly for the tip!