Hi , I can’t turn on/off my mobile data through control centre for IOS 12.1 , can anyone help me solve this issue?

Hi IDav1102,

Thanks for using Apple Support Communities. It sounds like you’re having trouble turning off cellular data from Control Center. I’m happy to provide some steps that might help.

To start, I suggest restarting your iPhone if you haven’t already. If that doesn’t help, and you’re able to turn off cellular data by tapping Settings > Cellular (or Mobile Data), the next thing I’d try is resetting your network settings. This will remove any saved Wi-Fi passwords and VPN / APN data, so you’ll want to have that handy. Then, tap Settings > General > Reset > Reset Network Settings.

If the above doesn’t work, I’d advise reinstalling iOS. This should not remove any of your data, but it’s always a good idea to have a recent backup:

How to back up your iPhone, iPad, and iPod touch - Apple Support

You can find instructions for reinstalling iOS under the section labeled “Put your device in recovery mode and set it up again” in the article below:

If you can't update or restore your iPhone, iPad, or iPod touch - Apple Support

Take care.