The Fujitsu Toshiba IS12T was identified by Fujitsu as the world’s first smartphone running Windows Phone 7.5, the operating system known by its development codename, Mango. It was a Japanese carrier launch—not a worldwide retail release—and went on sale through KDDI and Okinawa Cellular on August 25, 2011.
What “world’s first Mango phone” means
Fujitsu’s later account described the IS12T as the first smartphone in the world to run Windows Phone 7.5. “Mango” was the software’s development codename; the phone’s official product name used Windows Phone 7.5. That retrospective worldwide-first wording is distinct from the July 2011 launch announcement, in which KDDI called it Japan’s first water- and dust-proof smartphone featuring Windows Phone 7.5. KDDI’s announcement and Fujitsu’s availability notice document the launch, while Fujitsu’s 2013 retrospective supports the worldwide-first description.
| # | Preview | Product | Price | |
|---|---|---|---|---|
| 1 |
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Toshiba DKT-3010SD Phone Charcoal Gray (Renewed) | $56.00 | Buy on Amazon |
| 2 |
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Toshiba DKT3201 Phone | $75.00 | Buy on Amazon |
When and where it launched
Fujitsu Toshiba Mobile Communications manufactured the IS12T. KDDI and Okinawa Cellular sold it in Japan, and Microsoft Japan supplied Windows Phone 7.5. The initial July 27, 2011 announcement projected availability after September. A later Fujitsu and Fujitsu Toshiba notice updated the schedule: sales began August 25, 2011. The August date is the actual announced start of availability, not a second launch date.
IS12T launch specifications
| Feature | Launch specification |
|---|---|
| Display | Approximately 3.7-inch TFT LCD; WVGA, 800 × 480 pixels |
| Rear camera | 13.2 megapixels |
| Built-in memory | 32 GB; KDDI’s specification did not list external memory |
| Dimensions | Approximately 59 × 118 × 10.6 mm (width × height × thickness) |
| Weight | Approximately 113 g with battery |
| Water and dust resistance | IPX5/IPX8 water resistance and IP5X-equivalent dust resistance, as stated in Japanese launch materials |
| Mobile network | CDMA 1x EV-DO Rev.A / WIN HIGH SPEED, for the original Japanese carrier service |
| Other wireless | Wi-Fi IEEE 802.11b/g/n and Bluetooth |
| Colors | Citrus, Magenta, Black |
| Advertised battery life | Approximately 400 minutes of continuous talk or 280 hours of standby, according to launch specifications |
These are the manufacturer and carrier’s 2011 specifications, not measurements of surviving devices. The resistance ratings describe the phone as specified at launch; they do not guarantee that seals on an aged or previously repaired handset still work. The listed CDMA network is likewise a historical specification and does not establish that the phone can connect to a network today.
#1 Best Overall
- This Certified Refurbished product is tested and certified to look and work like new. The refurbishing process includes functionality testing, basic cleaning, inspection, and repackaging. The product ships with all relevant accessories, a minimum 90-day warranty, and may arrive in a generic box. Only select sellers who maintain a high performance bar may offer Certified Refurbished products on Amazon.com
- The DKT3010SD telephone is compatible with ALL Toshiba digital
- systems including Strata DK8, 14, 16, 16e, 280, 424 and CTX/CIX 28, 100, 670.
- Clear LCD display for extension information, caller id, date/date,
- telephone number, accessing voicemail and programming. Speaker
What Mango added to the phone
Windows Phone 7.5’s launch pitch centered on bringing related information together and making common tasks easier to reach. The People hub aggregated contact, email, and social-network information. The software also advertised viewing and editing Office documents, storing and sharing files through Windows Live SkyDrive, Internet Explorer 9 technology, and entertainment apps. Fujitsu’s Japanese launch material additionally described syncing music from a Windows PC with Zune over a microUSB cable. These were 2011 features and service descriptions; they should not be read as a statement that the services or integrations remain available or supported.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Finding an IS12T today
The IS12T is now chiefly relevant as a collectible or retro-device search. For an exact-model search, use “Fujitsu Toshiba IS12T smartphone.” The available launch information does not establish present-day stock, used-device condition, pricing, account setup, unlocking status, or compatibility with current mobile networks, so it is not enough to recommend the phone as an everyday handset.
Quick Recap
Rank #2
- Toshiba
- Strata
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
