iPhone eSIM Troubleshooting

Symptoms

• Signal bars but no internet
• Stopped working right after switching data line
• Very slow speed
• "Activation failed" message

Try in This Order

Step 1. Toggle Airplane Mode

The simplest and most effective fix.

• Control Center: Airplane mode ON → wait 10s → OFF

This solves 70% of cases.

Step 2. Recheck eSIM Line & Roaming State

In Settings > Cellular:

• ✅ eSIM (travel) line ON
• ✅ eSIM line Data Roaming ON
• ✅ Default data = eSIM
• ✅ Korean SIM Data Roaming OFF

Step 3. Enter APN Manually

If auto-connect doesn't work, enter APN directly.

1. Settings > Cellular > Cellular Data Network
2. Enter the APN value from esimoa (often internet or the provided string)
3. Username / password usually blank

Step 4. Manual Network Selection

Useful when auto-select picks the wrong carrier.

1. Settings > Cellular > eSIM Line > Network Selection
2. Turn Automatic OFF
3. Pick the carrier indicated by esimoa (search can take a while)

Still Not Working?

• Restart iPhone (full power off)
• Toggle the eSIM line off and on while on Wi-Fi
• Contact support with ICCID, country, and a screenshot

FAQ

• What if I see "Activation failed"? → Don't delete and reinstall. Contact support first — some plans charge for re-issuance.
• Is slow speed normal? → Some countries deprioritize roaming. Try manual network selection.