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: Nanapho.jp, thanks tezawaly for the tip!
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Rich Edmonds was formerly a Senior Editor of PC hardware at Windows Central, covering everything related to PC components and NAS. He's been involved in technology for more than a decade and knows a thing or two about the magic inside a PC chassis. You can follow him on Twitter at @RichEdmonds.