If an eSIM is not working in South Korea, the usual causes are the wrong data line, roaming being disabled, delayed network registration or an expired allowance.
Work through one change at a time while airport or hotel Wi-Fi remains available.
NoveSIM plans are data-only, so test a webpage or map rather than a conventional call or SMS.
Quick answer: Turn on the travel line, select it for mobile data, enable roaming on that line, keep network selection automatic and toggle Airplane Mode for 20 seconds. If signal appears without data, check the APN is data.esim. Do not delete the eSIM.
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Why Is Your South Korea eSIM Not Working?
- Open the phone’s SIM settings.
- Confirm the South Korea eSIM is enabled.
- Select it for mobile data.
- Turn off automatic data switching and primary-SIM roaming.
On a dual-SIM phone, the profile can be installed correctly while the handset continues using the home line.
Restore Network Registration
Enable roaming on the travel eSIM when required, leave network selection automatic and wait several minutes. Toggle Airplane Mode once, then restart if registration does not return. Compare outdoors before changing more settings. See the South Korea coverage guide.
Check Allowance and APN
Confirm the plan is active and has remaining data on the current Republic of Korea eSIM plan. If the phone shows signal but apps cannot load, use data.esim when manual APN entry is required.
When to Contact Support
Send the phone model, location, screenshots, network indicator and steps already tried. Never share the QR code publicly and do not remove the profile unless support instructs you to do so. For slow data, use the slow-data diagnosis.
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FAQ
Why does my eSIM show signal but no data?
The wrong data line, disabled roaming, exhausted allowance or incorrect APN can cause this.
What APN should NoveSIM use?
Use data.esim when manual entry is required.
Should I select a Korean network manually?
Start with automatic selection. Test only supported networks if the instructions request it.
Should I reinstall the eSIM?
No. Deleting it can prevent reuse of the installation code.
Final Recommendation
If your South Korea eSIM is not working, check the data line, roaming, registration, allowance and APN in that order. Preserve the profile and contact support with clear evidence if data remains unavailable.