Sony Xperia Ace III
The Sony Xperia Ace III brings eSIM support to Sony's compact, affordable domestic line. Perfect for users in Japan and visiting travelers using Roamix.
- eSIM slots1
- Physical SIMYes
- eSIM-onlyNo
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The Sony Xperia Ace III is a Japan-domestic compact smartphone sold by docomo, au, and SoftBank. eSIM is supported but requires SIM unlock from the Japanese carrier first. Japanese carrier firmware can sometimes reject international eSIM profiles after unlock — see troubleshooting below.
Key Takeaways
- Japan-domestic model only — not sold internationally.
- eSIM requires SIM unlock from docomo/au/SoftBank first.
- Japan carrier firmware may reject third-party eSIMs even after unlock.
- One eSIM active alongside one physical nano-SIM.
Does the Sony Xperia Ace III Support eSIM?
Yes. The Xperia Ace III includes eSIM hardware and is sold with eSIM capabilities by major Japanese carriers. However, the device must be SIM-unlocked before a third-party eSIM like Roamix can be installed. Japanese carriers charge a fee or have an eligibility period before SIM unlock requests are accepted.
Japan carrier firmware note: Some Japan carrier firmware variants of Xperia devices can reject non-Japanese eSIM profiles after SIM unlock. This is a firmware behavior unique to Japan-market devices — not present on international Xperia models.
How to Activate eSIM on Xperia Ace III
- Confirm SIM unlock status with your Japanese carrier (docomo/au/SoftBank).
- Open Settings.
- Tap Network & internet.
- Tap Mobile network.
- Tap the + icon.
- Select Download eSIM or Add eSIM.
- Scan the Roamix QR code on Wi-Fi.
- Follow prompts to complete installation.
- Set Roamix eSIM as default data and enable Data Roaming.
Troubleshooting Xperia Ace III eSIM
eSIM activation fails with "carrier not supported" after SIM unlock: Japan carrier firmware issue. Try removing the physical SIM during activation and using only Wi-Fi. If the issue persists, contact Roamix support — some Japan-firmware Xperia devices require manual SM-DP+ entry instead of QR code scanning.
"Download eSIM" option not visible: Device may still be carrier-locked. Contact your Japanese carrier (docomo: 151, au: 157, SoftBank: 157) to request SIM unlock. The Ace III must be fully carrier-unlocked for third-party eSIM.
eSIM installed but no service abroad: Set Roamix as default data SIM and enable Data Roaming. Toggle Airplane Mode on/off to re-register to a local network on arrival.
| Model | eSIM Slots | Physical SIM | eSIM-Only | Released |
|---|---|---|---|---|
| Xperia Ace III | 1 | Yes | No | 2022 |
Sony Xperia Ace III eSIM — Frequently Asked Questions
Does Sony Xperia Ace III have eSIM?
Yes. The Xperia Ace III sold in Japan by docomo, au, and SoftBank includes eSIM hardware. It must be SIM-unlocked before third-party eSIMs like Roamix can be installed. Contact your Japanese carrier to request SIM unlock.
Can I use Roamix on an Xperia Ace III from Japan?
Yes, if the device is carrier-unlocked. Japanese carriers (docomo, au, SoftBank) lock their Xperia Ace III variants. After unlocking, activate Roamix via Settings → Network & internet → Mobile network → + → Download eSIM.
Why does my Xperia Ace III eSIM fail after SIM unlock?
Japanese carrier firmware may reject non-Japanese eSIM profiles even after SIM unlock. Try activating with the phone connected to Wi-Fi and no active physical SIM inserted. If the issue persists, it may require a firmware update or regional firmware change.
Is the Xperia Ace III sold outside Japan?
No. The Xperia Ace III is a Japan-domestic model and not officially sold outside Japan. International models in the Xperia lineup are the 1, 5, and 10 series. Xperia Ace is Japan-market only.
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