The iPhone will reboot. Once it turns on, the default network settings will be restored.
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If you encounter problems with your data connection, or other wireless connections, you can reset the network settings back to default. All of the network settings on your Apple iPhone will be reset, including those for Wi-Fi, mobile data and VPN.
iPhone 6 Plus, 6s, 6s plus, 7, 7 Plus, 8, 8 Plus, SE (2nd Gen), X, Xs, Xs Max, XR, 11, 11 Pro, 11 Pro Max.