How To Fix iPhone “Cellular Update Failed” Issue In iOS 12.1.2

Some iOS users reported that the cellular connectivity and data on their device recently malfunctioned, and they could no longer access the web and receive or make calls. This occurred after they updated to the iOS 12.1.2 version.

The failure to offer a data connection is typically complemented by “No Service” notification at the left corner where the carrier signal is showcased. So, to help you get rid of this problem, this post will show you possible solutions to fix “Cellular Update Failed” in iOS 12.1.2 version.


Solutions to Cellular Update Failed Error in iOS 12.1.2


Before proceeding, you should first check for the system update for your device. If there is one available, just go ahead and install it. You can check it by heading to Settings > General > Software Update, or by connecting your device to iTunes checking for available updates from there.

Remember that for some users, the following methods could resolve the “Cellular Update Failed” and ‘No Service” problems, but might not for all. Another simple workaround is to reboot your phone every time the service is required since your iPhone/iPad will be possible to regain cell service. Additionally, you should also follow different instructions each time, since the force reboot method varies for different iPhone/iPad models.

How to Address “No Service” and “Cellular Update Failed” Issue in iOS 12.1.2

The existing methods to fix the cellular data issue requires toggling off Wi-Fi calling and modifying LTE data settings to “data only” instead of data and voice. For some users, it might not be viable as a permanent fix, but in fact, it’s fixable and you can select whether you disable Wi-Fi calling and LTE voice temporarily as worth of regaining cellular service.

Step 1: Open “Settings” app on your iPhone/iPad

Step 2: Head to “Cellular” tap on “Wi-Fi Calling” and toggle off Wi-Fi calling. This might have fixed the problem for some.

Step 3: Navigate to Cellular Settings again and choose “Cellular Data Options” this time Step 4: Tap on “Enable LTE” and change the setting from Voice & Data to “Data Only.”


Step 5: Return to Home screen

For many iOS owners, these steps can restore the cellular service, though voice LTE and Wi-Fi calling will be temporarily lost. However, some iPhone owners have also reported that choosing one of the settings above is already enough to eliminate the cellular problem.

Since it’s just a settings change, so you do not need to reboot your handset. You simply switch off the device to get the job done.

Also see: How To Fix Continuity Camera Not Working Between iOS 12 and macOS Mojave

Search for & Install Cellular Carrier Updates

Some iPhone users still see the “Cellular Update Failed” error message on their device, where they should find if their network service provider releases an update, and install it if it’s available. The update from the carrier is quite different from the normal iOS updates. Here are a step-by-step guide to checking for carrier updates:

  1. Connect your iPhone to a Wi-Fi network if it’s not already connected to.
  2. Head to Setting > General > About and scroll down to tap on “Carrier
  3. Wait for a while. If there is an update for the carrier, simply tap on “Update” to continue the installation.


The carrier update is not available to everyone, but it’s worth checking if there’s one available. There is many people being able to fix the cellular connectivity issues on their iOS device by just installing carrier updates, so this is the method you should keep an eye out for.

Extra Cellular Problem Troubleshooting

If you have already tried all prior steps, but your device still continues to appear cellular connection issues, you should proceed with the troubleshooting steps outlined below:

  • Force restart your iPhone/iPad. The process is different based on the model you’re using.
  • Reset the Network Settings. You will need to note the Wi-Fi password since you’ll have to re-enter them, along with doing other customizations on your device.
  • If your iPhone can still receive or make calls, but fails to send data, you should then then try other tips for cellular data malfunction.
  • Remember to create a backup of the iPhone through iTunes or iCloud, and then perform a restore from that backup.
  • Search for system iOS updates by going to Settings > General > Software Update.
  • Contact Apple, or your cellular provider to get more assistance if none of the troubleshooting steps from above can get rid of your issue of cellular data. You should inform the official sources about the troubleshooting.

If the cellular issues are related to an iOS bug, then a new iOS update from Apple can address the matter completely, though Apple doesn’t give the detailed information for the next official iOS update. It’s also important to note that you should stay with updates about system software.

If a newly iOS 12.1.3 beta update can resolve cellular data issues on your iPhone, you should try update your phone to this beta version and then check if the problem is completely gone.

With the above solutions, we hope you can get your cellular connectivity and cellular data back to working, and you will no longer see the “Carrier Update Failed” and “No Service” error. If you have other resolutions for solving these problems, let’s know in the comment below.

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