Kyocera
Kyocera KYF42 (Gratina)
A tidy au flip that dropped Japan's 3G, so calls there are VoLTE or nothing.
Secondhand Enthusiast imports and alternatives
$148 to $202
Y2KPHONES sell it at GBP 109.99 refurbished and GBP 149.99 new in a sealed box, roughly $148 to $202, with free worldwide shipping and a 120-day warranty. Both variants were in stock when I checked.
- TypeFlip
- SoftwareAndroid
- Screen3.4" LCD
- Network2G / 3G / 4G
- Introduced 2021
Software and apps
- Operating system
- Android 10 (custom Japanese build)
- App store
- Curated apps
- Web browser
- Yes
- YesCarrier mail, the way every Japanese keitai has it.
- Sideloading
- Unknown
- No
- Spotify
- No
- Podcasts
- Unknown
- Apple Music
- Unknown
- Your own MP3s
- Unknown
- RCS messaging
- Partly
- Group texts
- Unknown
- Android Auto
- NoA closed au build with no Play services.
- Maps
- Unknown
Hardware
- Form factor
- Flip (keitai)
- Screen
- 3.4-inch 854x480 FWVGA TFT, about 16.7 million colors, plus a single-color 0.9-inch OLED sub-display on the lid.
- Camera
- Yes
- Battery
- 1,500 mAh user-replaceable
- USB-C
- Yes
- Headphone jack
- No
- Water and dust
- IPX5/IPX8 and IP5X
- Weight
- 125 g
Connectivity
- Network
- 2G / 3G / 4G4G LTE only in Japan, up to 150Mbps down and 50Mbps up, with no 3G fallback there at all. Abroad it roams on GSM, UMTS or LTE, and there is a setting that drops it to 3G when the local 4G is poor.
- VoLTE
- Yes
- SIM
- Physical SIM + microSDOne nano-SIM (au's Nano IC Card 04 LE), plus a microSDHC slot up to 32GB.
- Wi-Fi hotspot
- Unknown
- Bands
- GSM 850/900/1800/1900 | LTE | CDMA 850/1900/2000 1xEV-DO
- Carriers
- Sold by au (KDDI) in Japan and unlocked by exporters. Abroad it roams on GSM, UMTS or LTE, but neither Kyocera nor KDDI ever published its band list, and KDDI says it guarantees nothing on another operator's SIM. Treat any US or European network as unverified until the seller confirms the band table.
Where to get one
- Regions
- Import only
- Countries
- Japan; exported worldwide
- Also sold at
- y2kphones.com; eBay Japan sellers
Notes
au's manual says flatly that the phone cannot use Google Play, and apps come from au Smart Pass, which wants an au ID and a Japanese line. It is 4G only in Japan with no 3G fallback. Nobody ever published the band list, which is the one thing you need before importing it.
Last updated September 16, 2026.
