Kyocera GRATINA 4G

The first Android phone made by Kyocera for au¹. The KYF31 model and it's derivatives only supported 4G, the later KYF34 model added 3G fallback capabilities.

Specs

Phone	KYF31²	KYF34³	KYF31U^4,⁵	KYF31Z⁶
CPU	MSM8909 1.1GHz quad core
RAM	1 GB
Internal storage	8 GB
External storage	microSDHC up to 32GB
Battery	1500mAh (removable)
Battery model	KYF31UAA^7,⁸		KYF31UAU⁹	?
Primary display	3.4“ FWVGA TFT
External display	0.93” 1 color OLED display
Camera	8MP CMOS			None
Operating system	Android 5.1.1¹⁰
Durability ratings	IPX5/IPX8, IP5X, MIL-STD-810G
Dimensions	51×113×16.7mm
Release date	February 19, 2016	April 21, 2016	Late march, 2016	?
Colors	Green, pink, white, black	Champagne white, metal black	Grey, white	Black

Connectivity

Main article: Cellular bands

Radios	KYF31¹¹	KYF34¹²	KYF31U	KYF31Z
4G bands (LTE)	1, 18
3G bands (W-CDMA)	None	1	None	None
2G bands (GSM)	Unknown

Miscellaneous¹³
Calling	VoLTE
Wi-Fi	IEEE802.11b/g/n (2.4GHz only)
Bluetooth	4.1
Ports	microUSB¹⁴
Tethering	Up to ten devices
Other features	1seg, infrared sensor, GPS, Osaifu-Keitai¹⁵

Operating system

Updates

Versions
Phone

Third-party applications

Main article: Third party apps

Variants

KYF31

KYF34

au model released later on with the capability to fall back on 3G bands.

KYF31U

UQ mobile model marketed as “DIGNO Phone”. To avoid confusion when referring to this phone it will should be called the “UQ mobile DIGNO Keitai”.

KYF31Z

This model has very little information available on it besides a mention on the KYF31 Wikipedia page and some mentions in blog posts. The model is allegedly a business oriented model that only comes in black, and loses the camera.

Notes

https://lpcwiki.miraheze.org/wiki/Kyocera_KYF31

Guides

Official pages

Phone	KYF31	KYF34	KYF31U
Product pages	Kyocera page
Product pages	au KDDI page		UQmobile page Kyocera page
Manuals	au manual (English)	au manual (Japanese)	UQ mobile manual (Japanese)
Specs	Kyocera page		Kyocera page