If cellular data stops working after an iOS update, the update itself may not always be the direct cause. The problem can also come from a carrier outage, a disabled cellular line, outdated carrier settings, an APN configuration that was reset during the update, or a temporary failure during network registration.
Use the following steps in order, testing cellular data after each one. Connect to Wi-Fi before installing updates or contacting your carrier.
1. Confirm That Cellular Data Is Enabled
Open Settings → Cellular and confirm that Cellular Data is turned on. Temporarily disable Wi-Fi and open a trusted website to test the cellular connection directly.
If only one application cannot connect, scroll down on the Cellular screen and confirm that cellular access is enabled for that specific app. An iOS update does not necessarily enable data for an application that was previously restricted.
2. Check the Active Line on Dual-SIM iPhones
If the iPhone uses Dual SIM or multiple eSIMs, open Settings → Cellular → Cellular Data and verify that the correct line is selected for data.
Then open the affected line and confirm that it is turned on. You can switch the line off, wait several seconds, and turn it back on to force a fresh connection. Do not delete an eSIM unless your carrier specifically instructs you to do so, because restoring it may require a new activation process.
3. Toggle Airplane Mode for at Least 15 Seconds
Open the Settings app and turn on Airplane Mode. Wait at least 15 seconds before turning it off. Apple recommends this step to make the iPhone attempt a new connection to the cellular network.
After Airplane Mode is disabled, wait for the carrier name and signal indicator to return before testing cellular data.
4. Restart the iPhone
Restarting clears temporary processes that may not have initialized correctly after the iOS installation. Turn the iPhone off normally, wait approximately 30 seconds, and turn it on again.
If the status bar displays SOS, No Service, or Searching after the restart, the problem involves the complete cellular connection rather than data access for one application.
5. Check for a Carrier Outage or Account Problem
Before changing more settings, check whether the carrier is experiencing an outage. If possible, ask another customer using the same network in the same area whether their service works.
Sign in to the carrier account over Wi-Fi and confirm that:
- The account and cellular plan are active.
- The data allowance has not been paused or exhausted.
- The iPhone or line has not been blocked.
- The carrier has not reported a local network outage.
Only the carrier can confirm account-level restrictions, activation problems, and network outages.
6. Install Available iOS Updates
Open Settings → General → Software Update. If Apple has released a newer version compatible with the iPhone, install it while connected to Wi-Fi and power.
Avoid claiming that a particular update specifically repairs cellular service unless Apple documents that change in its release information. A newer update may include relevant corrections, but it should not be presented as a guaranteed fix.
7. Check for a Carrier Settings Update
Connect the iPhone to Wi-Fi, then open Settings → General → About. Remain on the About screen for several seconds. If the carrier has published an update, iOS should display a prompt allowing it to be installed.
You can view the current carrier settings version next to the carrier information on the same screen.
8. Check the SIM or eSIM Status
For a physical SIM, turn the iPhone off before removing it. Inspect the SIM and tray for visible damage, then reinstall it securely. Skip this step if the iPhone uses only an eSIM.
If the phone displays Invalid SIM, SIM Failure, or a similar alert, contact the carrier. Replacing a SIM or reactivating an eSIM normally requires carrier assistance.
9. Check APN Settings Only With Carrier Guidance
An iOS update may reset manually entered Access Point Name settings to the carrier defaults. This is particularly relevant for business plans, smaller carriers, and phones using custom configuration profiles.
Do not guess or copy APN values from an unofficial website. Incorrect APN settings can prevent cellular data from working and may lead to unexpected charges. Contact the carrier and use only the settings it provides.
If the carrier allows APN editing, the menu may appear under Settings → Cellular → Cellular Data Network. Not every carrier exposes this option.
10. Temporarily Disable a VPN
A VPN or security profile can make a working cellular connection appear broken if it fails to reconnect after the update. Temporarily disable the VPN and test a trusted website.
If cellular data works without the VPN, update or reconfigure the VPN application before enabling it again. Users of employer-managed devices should contact their administrator instead of removing a required configuration profile.
11. Reset Network Settings
Use this as a later troubleshooting step because it removes saved network information. Go to:
Settings → General → Transfer or Reset iPhone → Reset → Reset Network Settings
This reset does not erase photos, applications, or other personal media. However, it removes or resets network settings, including saved Wi-Fi networks, passwords, VPN-related settings, and manually trusted certificates. Make sure you can recover the required passwords and configurations before continuing.
12. Contact the Carrier or Apple
If the carrier confirms that the account, SIM or eSIM, coverage, and network are working normally, contact Apple Support. On supported iPhones running a recent iOS version, the Apple Support app may provide additional diagnostics.
Record the iPhone model, iOS version, carrier settings version, exact error message, and whether calls and text messages still work. These details help separate a carrier problem from an iOS configuration or hardware issue.
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