Sony Xperia 1 Series

The Sony Xperia 1 series (IV through VII) supports eSIM on the international/unlocked variant. One active eSIM at a time alongside the physical nano-SIM. The critical Sony-specific caveat: Japanese carrier firmware (docomo, au, SoftBank) may show the eSIM menu but actively reject non-Japanese eSIM providers during activation.

Key Takeaways

• Xperia 1 IV, V, VI, VII: eSIM supported on international unlocked variant.
• Japanese carrier firmware variants: eSIM menu present but third-party eSIMs (including Roamix) may be rejected.
• Activation path: Settings → Network & internet → SIMs → + → Download a SIM instead.
• Carrier unlock required — but Japanese devices may also need firmware change.

Does the Sony Xperia 1 Series Support eSIM?

Yes, on the international/unlocked variant. Starting with the Xperia 1 IV (2022), all Xperia 1 flagships include eSIM hardware.

Japan carrier firmware warning: Xperia 1 devices sold in Japan through docomo, au, or SoftBank use carrier-specific firmware that may restrict eSIM to Japanese carrier profiles only. Even after SIM unlock, the firmware may reject non-Japanese eSIM provider profiles. If you bought your Xperia 1 in Japan with a carrier contract, you may need to flash the international (non-carrier) firmware to use Roamix. This is a Sony Japan firmware behavior, not a hardware limitation.

Sony Xperia 1 Models and eSIM Compatibility

How to Activate eSIM on Sony Xperia 1 Series

1. Open Settings.
2. Tap Network & internet.
3. Tap Mobile network.
4. Tap Add eSIM.
5. Select Scan QR code.
6. Scan the QR code sent by Roamix to your email.
7. Follow the on-screen prompts to complete the installation.
8. Set the Roamix eSIM as your preferred data SIM.
9. Turn on Data Roaming in the settings for the Roamix line.

Sony Xperia 1 eSIM for International Travel

Roamix works with any unlocked Xperia 1 running international firmware. Purchase a plan, scan the QR code on Wi-Fi, and connect to local partner networks on arrival.

Carrier unlock check: Settings → About phone → SIM lock status. Contact your carrier if locked.

Troubleshooting Sony Xperia 1 eSIM

"Add eSIM" or "Download a SIM instead" missing: Check Settings → Network & internet → SIMs — if the + icon is absent, your device may be carrier-locked. Contact your carrier to unlock.

eSIM activates but shows "Activation failed" or profile rejected: This is the Japan carrier firmware issue. Docomo, au, and SoftBank firmware on Xperia devices may reject non-Japanese eSIM profiles even after SIM unlock. You need the international non-carrier firmware. Contact Sony Japan support or search XDA Developers for your specific model's firmware flashing guide.

eSIM installed but no data abroad: Settings → Network & internet → SIMs → select Roamix → enable Data Roaming → set as preferred data SIM. Toggle Airplane Mode on/off.

QR code scan fails: Must be on Wi-Fi. Try entering the SM-DP+ address manually (tap "Enter activation code" if available in your Android version).