Reset Your iPhone’s Network Settings

One of the last things you can try is resetting your network settings. This will let your iPhone reconnect to cellular and Wi-Fi networks from scratch, possibly fixing your phone call issues.

Keep in mind, though, that resetting your network settings will erase any saved Wi-Fi networks stored on your iPhone. It may also remove VPN connections, depending on how they were added. Ensure you know the passwords of any Wi-Fi networks you regularly hang out on as you’ll need to join them again from scratch.

Here’s how to reset your network settings:

1. Open the Settings app.
2. Scroll down and go to General.
3. Scroll down again, and tap on Transfer or Reset iPhone.
4. Tap on Reset.
5. Select Reset Network Settings.
6. Enter your passcode and confirm that you want to reset your network settings.