If iPhone cellular data is not working, first check your carrier's outage status and account balance, then confirm Cellular Data is on and the correct SIM is selected. Toggle airplane mode for at least 15 seconds, restart the iPhone, and check carrier settings. Do not delete your eSIM as an early troubleshooting step.
Quick Checks Before Changing Settings
Determine whether the issue affects every app or only one. Test a simple webpage with Wi-Fi off, and check whether the phone shows signal bars, SOS, No Service, or Searching. Confirm coverage, an active plan, remaining data allowance, and any carrier outage. Apple recommends checking with your carrier for account and outage problems in its official No Service guide.
| What you see | Likely next check | Avoid |
| Bars but no internet | Data toggle, selected SIM, allowance, VPN | Deleting eSIM |
| SOS / No Service | Coverage, outage, enabled line | Assuming a data-only app problem |
| Only one app fails | App cellular permission and app status | Resetting the whole phone |
| Data fails abroad | Destination coverage, selected travel line, roaming | Enabling home roaming blindly |
Fix 1: Check Cellular Data and the Selected Line
Open Settings > Cellular (or Mobile Data) and enable Cellular Data. On a dual-SIM iPhone, tap Cellular Data and choose the line intended for internet access. Check that the chosen line is enabled. Scroll down to confirm that the affected app is allowed to use cellular data. Apple's cellular settings guide explains these controls.
Fix 2: Toggle Airplane Mode, Then Restart
Open Settings > Airplane Mode, turn it on for at least 15 seconds, then turn it off. Wait for cellular registration. If service remains unavailable, restart the iPhone. This is a reversible step and is safer than removing the cellular plan.
Fix 3: Check Carrier Outages, Billing and Data Limits
Use Wi-Fi to check your carrier's service-status page or contact support. Confirm the account is active, the plan includes data, there is no local outage, and the line is not barred. If your iPhone was purchased abroad, local IMEI-registration rules may also matter in some countries. A phone setting cannot fix a carrier outage or suspended account.
Fix 4: Check iOS and Carrier Settings
With Wi-Fi connected, open Settings > General > Software Update. Then open Settings > General > About and accept any offered carrier-settings update. Do not interrupt an update or start it without adequate battery and a reliable connection.
Fix 5: Review VPN and App Restrictions
Temporarily disconnect a VPN using its own app or iPhone settings, then retest. Do not delete workplace-managed VPN or configuration profiles without administrator approval. If only one app fails, check its cellular-data permission and service status before changing system-wide settings.
Fix 6: Check Roaming Only on the Intended Travel Line
When abroad, select the travel eSIM for Cellular Data and follow its provider's instructions for Data Roaming. Keep roaming disabled on your home SIM unless your home carrier's plan supports it. Read Eskimo's data roaming guide for the distinction between lines. If the destination is outside your plan's coverage, enabling roaming will not create coverage.
Fix 7: Reset Network Settings Only If Needed
If reversible checks fail, consider Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings. This can remove saved Wi-Fi networks and passwords and reset cellular, VPN, and related network settings. Record anything you will need to reconnect first. Do not choose Erase All Content and Settings.
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When to Contact Your Carrier, Eskimo or Apple
Contact your carrier or eSIM provider if the line is missing, provisioning has failed, a QR code is rejected, data allowance is unclear, or an outage is suspected. Contact Apple if the carrier confirms service and the iPhone still shows persistent cellular errors or suspected hardware failure. Apple Support's diagnostics may be available on supported iPhones.
Do not remove an eSIM unless its provider confirms a valid replacement or reinstall method. Some codes are single-use, and deleting a profile can leave you without service.
Mobile Data for Travel
A working travel data line helps with navigation, bookings, and emergency coordination. Test your setup on Wi-Fi before departure and keep important documents downloaded for offline access.
Eskimo travel eSIM plans cover eligible destinations within Eskimo's overall footprint of 175 countries and regions. A given Global plan can include fewer destinations. Eskimo's universal eSIM is reusable where supported. For setup, see the iPhone eSIM installation guide.
New users can claim a free 500MB Global eSIM, subject to current eligibility and terms.
Frequently Asked Questions
Why do I have signal bars but no cellular internet?
The data line may be off, the allowance exhausted, a VPN may interfere, or the carrier may have a data-service problem. Check those before resetting settings.
Should I delete my eSIM if mobile data stops working?
No. First check the line selection, plan status, roaming requirements, and carrier provisioning. Confirm reinstallation with the provider before deletion.
What does SOS Only mean?
Your iPhone is not connected to its normal cellular network; emergency calling through another network may be possible in supported regions. See Eskimo's SOS Only guide.
When should I contact Apple Support?
After your carrier confirms there is no account, coverage, outage, or provisioning issue and the phone still cannot connect, especially if hardware failure is suspected.
Conclusion
Start with the least disruptive fixes when iPhone cellular data stops working: confirm coverage and your account, select the correct line, toggle airplane mode, and restart. Then check updates, app permissions, and travel roaming settings. Reserve network resets for persistent problems, and never treat eSIM deletion as a routine fix. If the carrier reports an outage or provisioning fault, wait for or request carrier support. If service is confirmed but the device still fails, contact Apple for further diagnostics.
