Engineering:Fujitsu ARROWS ef

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Short description: 2012 Japanese smartphone
ARROWS ef FJL21
File:250px
Brandau
ManufacturerFujitsu Mobile Communications
SeriesArrows
Compatible networks3G: CDMA2000 1xMC (au 3G) (New 800 MHz / 2 GHz), W-CDMA (850 MHz / 2 GHz)
2G: GSM (1.9 GHz / 1.8 GHz / 900 MHz)
First releasedNovember 2, 2012 (2012-11-02)
Dimensions127 mm (5.0 in) H
62 mm (2.4 in) W
10.7 mm (0.42 in) D
Mass139 g (4.9 oz)
Operating systemAndroid 4.0.4, upgradable to 4.1.2
CPU1.5 GHz dual-core Qualcomm Snapdragon S4 (MSM8960)
Memory1 GB RAM
Storage8 GB ROM
Removable storagemicroSD (up to 2 GB), microSDHC (up to 32 GB), microSDXC (up to 64 GB) (officially supported by KDDI)
Battery1,800 mAh
Display4.3-inch TFT LCD, HD (720 × 1280 pixels), approx. 16.77 million colors
Rear cameraApprox. 8.1 megapixels CMOS, autofocus, Full HD video recording
Front cameraApprox. 1.2 megapixels CMOS
References1. SAR value: 0.439 W/kg[1]
2. Equipped with an FM transmitter

The ARROWS ef FJL21 is a smartphone developed for the Japanese domestic market by Fujitsu Mobile Communications (under the Fujitsu brand, currently FCNT). It was released for KDDI and Okinawa Cellular Telephone Company under the au brand, featuring support for CDMA 1X WIN (au 3G) and 3.9G (au 4G LTE) mobile communication systems. It was released on November 2, 2012.[2][3]

It was updated to the version V35R45B and addresses critical bugs, most notably resolving an issue where incoming voice calls would occasionally fail to connect and leave no entry in the call history. It also corrects a display bug that caused wallpapers to appear abnormally enlarged.[4]

Specifications

The ARROWS ef is a compact flagship smartphone released for the Japanese carrier au as part of the high-end ARROWS series. Despite its smaller 4.3-inch display—a departure from the series' traditionally larger form factors—the device maintains high-end specifications. To appeal to a broader demographic seeking smaller devices, the manufacturer utilized narrow-bezel technology to minimize the phone's physical footprint without reducing the screen size.[5]

The smartphone incorporates several proprietary hardware and software features designed to improve usability. These include the "Human Centric Engine," which utilizes sensors to keep the display active while the user is actively viewing it, and a rear-mounted fingerprint sensor that doubles as a physical power switch for the display. Additionally, the device features a fast-focusing camera, the "NX! Eco" power-saving utility, and a scratch- and fingerprint-resistant exterior coating known as "Ultra Tough Guard Plus."[5]

References

  1. ↑ au電話の比吸収率について > ARROWS ef FJL21 - au (KDDI) Retrieved 2026-07-16.
  2. ↑ "auの2012年冬モデルスマートフォンの人気機種はどれ? - マイナビニュース調査 | マイナビニュース" (in ja). 2012-11-02. https://news.mynavi.jp/article/20121102-enquete_keitai2/. 
  3. ↑ "全部入りハイスペックスマホ「ARROWS ef」は初心者にも使いやすい端末だった | マイナビニュース" (in ja). 2012-11-22. https://news.mynavi.jp/article/20121122-arrowsef_review/. 
  4. ↑ "価格.com - au、ARROWS ef FJL21の着信不具合などを改善するソフトウェア" (in ja). https://news.kakaku.com/prdnews/cd=keitai/ctcd=3147/id=29877/. 
  5. ↑ 5.0 5.1 ASCII. "コンパクトなボディでフルスペック！ 富士通「ARROWS ef」" (in ja). https://ascii.jp/elem/000/000/736/736488/. 



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