Au Xperia Z4 SOV31

Xperia Z4 SOV31
Brandau
DeveloperSony Mobile
ManufacturerSony Mobile
TypeSmartphone
Series
Sony Xperia Z series
FamilyXperia
First released
June 11, 2015 (2015-06-11)
PredecessorXperia ZL2 SOL25
SuccessorXperia Z5 SOV32
3.9G: FDD-LTE (au VoLTE) (700 MHz/New 800 MHz/2 GHz)
3G: W-CDMA (850 MHz/2 GHz)
2G: GSM (1.9 GHz/1.8 GHz/900 MHz)
Bar
Colors
  •   White
  •   Black
  •   Copper
  •   Aqua Green
Dimensions146 mm (5.7 in) H
72 mm (2.8 in) W
6.9 mm (0.27 in) D
WeightApprox. 144 g (5.1 oz)
Android 5.0, upgradable to 7.0
Qualcomm Snapdragon 810 (MSM8994)
CPUOcta-core (4×2.0 GHz & 4×1.5 GHz)
GPUAdreno 430
Memory3 GB LPDDR4 RAM
Storage32 GB eMMC
microSD (up to 2 GB), microSDHC (up to 32 GB), microSDXC (up to 128 GB) (officially supported by KDDI)
SIMNano-SIM
Battery2930 mAh (non-removable)
ChargingApprox. 140 minutes
Rear camera20.7 megapixels, backside-illuminated stacked CMOS image sensor (Exmor RS for mobile), face detection autofocus, 4K UHD video recording, image stabilization, Timeshift video, AR effect
Front camera5.1 megapixels, CMOS image sensor (Exmor R for mobile), face detection autofocus, 4K UHD video recording, image stabilization, Timeshift video, AR mask
Display5.2 in (130 mm) TFT Triluminos Display for mobile, FHD (1920 × 1080 pixels), approx. 16.77 million colors
IPX5/IPX8 waterproofing, IP6X dustproofing
ModelSOV31

The Xperia Z4 SOV31 is a smartphone developed by Sony Mobile. It was released for the Japanese domestic market by KDDI and Okinawa Cellular Telephone Company under the au brand, featuring support for 3.9G (au 4G LTE / au VoLTE) and 4G (au 4G LTE CA / WiMAX 2+) mobile communication systems.

Overview

On June 11, 2015, the Japanese telecommunications carrier KDDI launched the Sony Xperia Z4 (model number SOV31) as part of its summer product lineup. While the device was released across all three major Japanese carriers—with NTT Docomo launching its version on June 10 and SoftBank on June 12—the core hardware specifications remained uniform across all variants.[1][2]

At launch, the outright purchase price of the SOV31 on the au Online Shop was 84,240 JPY. KDDI offered a monthly discount program ("Maitsuki Wari") totaling up to 41,040 JPY (distributed as 1,710 JPY per month over 24 months). For Mobile Number Portability (MNP) customers, an additional discount of 16,200 JPY was applied under a two-year contract. Consequently, the net effective price was 43,200 JPY for new contracts and upgrades, and 27,000 JPY for MNP transfers.[3]

Furthermore, the device was eligible for the "au Kaeru Wari Plus" campaign; under this promotion, MNP customers subscribing to eligible contracts could receive either two years of waived basic monthly fees (under legacy plans) or a cashback bonus of 10,000 JPY (under newer plans).

It was upgradable to Android 7.0 Nougat on March 30, 2017.[4]

References

  1. ↑ ASCII. "auのXperia Z4は11日！ 今週は3キャリアのZ4一斉発売". ASCII.jp (in Japanese). Retrieved 2026-07-16.
  2. ↑ 株式会社インプレス (2015-06-09). "au、「Xperia Z4」を6月11日に発売". ケータイ Watch (in Japanese). Retrieved 2026-07-16.
  3. ↑ "au 2015年夏モデルの価格をまとめてチェック――6月発売予定分まで". ITmedia Mobile (in Japanese). Retrieved 2026-07-16.
  4. ↑ kunkoku (2017-03-29). "auスマートフォン「Xperia Z5 SOV32」、「Xperia Z4 SOV31」に「Android 7.0（Nougat）」へのアップデートを3月30日（木）10時から開始。 - ソニーが基本的に好き。| ソニーショップくんこく". ソニーが基本的に好き。| ソニーショップくんこく - ソニーの最新情報や商品レビューなど、タメになる情報を日々発信しています。ご相談もお気軽にどうぞ！店舗にもぜひお越しください。 (in Japanese). Retrieved 2026-07-16.
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