iOS 12.1.1 mobile data not working for apps on iPhone XS/6s

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Many iPhone XS/8/7 users after updating to the iOS 12.1.1 are not able to connect application using mobile internet. There is some error with mobile data connection in iOS 12.1.1 and iOS 12. Some off the application are not connecting to the internet via mobile data however the same applications connects well when using data on wifi connection to internet.
 
iOS 12 mobile data not working 


The issue is happening only after updating the iOS 12 version to iOS 12.1.1 and the app are not connecting to internet on mobile data. Even after several restart the issue persists. Due to this the background app is not refreshing like what's app, outlook application in iPhone SE/6s. When opened the app it says you are not connected to internet but mobile data is ON all the time.

How to fix mobile data not working for apps in iOS 12.1.1 :


Fix 1: Update carrier network setting


You iPhone uses the network setting provided by your network carrier. Sometimes they become obsolete and causing such issues in iPhone like internet not working when mobile data in ON. The best option to fix this is to check with your network service provider about any pending updates. Even if it does not prompt for an update it is better to check with call support of network carrier provider about same.
Tap Settings -> General -> About. If an update is available, you'll see an option to update your carrier settings.
To check carrier settings on your iPhone/iPad, tap Settings > General > About and look next to Carrier. To see additional carrier information, tap the version number.
Please note if you insert a new SIM card into your iPhone or iPad, you need to download the carrier settings for your new carrier.

Fix 2:  Reset network setting

There can be chances that while upgrade process some of you network setting have messed up and not working properly while using mobile data.  To fix that you may try network reset on your iPhone by following setps:
  1. From the home screen, tap Settings.
  2. Scroll down to, then tap General.
  3. Scroll down to, then tap Reset.
  4. Tap Reset Network Settings.
  5. Tap Reset Network Settings to confirm.

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