Reset Network Setting - Apple iOS

Reset Network Setting - Apple iOS

Go to Settings  > General > Transfer or Reset iPhone > Reset

Press Settings.

Select General

Press General.

Scroll to the bottom - Select Transfer or Reset iPhone

Press Transfer or Reset iPhone.

Select Reset
Press Reset.

Select Reset Network Settings
Press Reset Network Settings.

Confirm Reset Network Settings
Press Reset Network Settings.

Reset Network Settings: This will force the device to flush out the carrier network settings.
Your device will reboot and download the new carrier network file.