Cellular Data Not Working in iOS 9 on iPhone or iPad? 6 Troubleshooting Tips
A number of iPhone and iPad users have discovered cellular data usage is failing to work after updating to iOS 9. The cellular data problem is typically manifested in a few ways; either an outright failure to transmit any data or access the internet whatsoever when the iPhone or iPad is connected to a cellular network (though wi-fi continues to work), a failure of certain apps to connect to mobile data or access cellular data, or, in some situations the Cellular Data button is disabled but grayed out and unable to be toggled on.
If you are experiencing cellular data transmission or mobile connection issues in iOS 9 or any of the iOS 9 point releases, you may be able to resolve the issue with some troubleshooting tips we’ll outline below.