Many users have found that cellular data not working on iPhone and iPad iOS 11 (check for iOS 11specific features if you need). And the problems can present in these ways: the iPhone or iPad can't transmit any data or access to the internet when connected to a cellular network, or some apps can't connect to the cellular data or the Cellular Data button is grayed out and can't be toggled on. If you are unlucky to experience such cellular data transmission or internet connection issues in iOS 11, you can find the solutions with tips we will outline below.
This method may sound useless and comical, but double-check the general settings of Cellular Data in iOS 11 is necessary before you go further.
Go to "Settings" >"Cellular" > toggle the "Cellular Data" on.
For some users who can't use the cellular data for certain apps, they must haven't turned on the cellular data for specific apps. The apps may work when your iPhone/iPad is connected to the internet with Wi-Fi but unable to access mobile data.
Go to "Settings" >"Cellular" > scroll down to check the apps you want to use are connected to cellular data or not. If not, tap it one by one and choose "WLAN & Cellular Data".
If you have made sure the Cellular Data is on but it still can't work, then you can try to reset network settings in iOS iPhone and iPad. This can often resolve cellular data failures and it's very simple.
Go to "Settings" > "General" > "Reset" > "Reset Network Settings" > enter the passcode to confirm the operation on the iPhone/iPad.
After you have finished reset network settings, continue to restart your iPhone/iPad. And this works well for Cellular Data button is grayed out and can't be toggled on or off.
Restart iPhone/iPad: press and hold the Sleep/Wake button until an option to "slide to power off" appears and turn it on after about 15 seconds by pressing and hold the Sleep/Wake button
Force restart iPhone/iPad: For iPhone 6 and former devices: press and hold down the Home button and the wake/sleep button until Apple logo appears. For iPhone 7 and later devices: press the Home button and the volume down button.
Cellular carrier providers will sometimes offer updates to the iPhone to increase compatibility with their network.
Go to "Settings" > "General" > "About" check to see if a cellular carrier settings updating is available.
If the cellular data not working in iOS 11 caused by the bugs in current iOS version, updating to the latest iOS 11 version may fix the problem.
Go to "Settings" > "General > "Software Update". If there is a new version available, download and install it on your iPhone or iPad.
If the cellular carrier and iOS updating still can't settle the issue. You can take an iPhone factory resetting and restore. Before you factory reset iPhone or iPad, you need to make a backup by using a free iPhone data transfer software - EaseUS MobiMover Free to easily and quickly transfer contacts, messages, notes, calendars, voice mails, books, Safari bookmarks & history, photos, videos, and audios to the computer at one click (click following download button to install and use EaseUS MobiMover Free). When the backup is done, you can reset your device and then restore iPhone/iPad with the backup file.
Go to "Settings" > "General > "Reset" > "Erase All Content and Settings ".
If you are unable to find a resolution with the above troubleshooting tips, the final way you can try is to downgrade iOS 11 to iOS 10/10.3.3. After the downgrading, restore your iPhone with an iOS 10 backup. Please keep in mind that the iOS 11 backup can't be restored to iPhone/iPad with iOS 10. Therefore, make sure you have an iOS 10 backup before downgrading, or you will lose all the device data.
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