Make sure your iPhone is connected to a Wi-Fi or cellular network before manually checking and installing a carrier settings update:
- From the Home screen, choose Settings.
- Select General.
- To learn more, go to About.
If an update is available, you will be requested to change your carrier settings.
To finish the carrier settings update on your iPhone 7, follow the onscreen prompts. Restart your iPhone 7 when the update is complete to check if things have improved.