Resetting your network settings restores all your network-related features to your device’s original factory state, including Wi-Fi, Bluetooth, VPN and much more.
iPhone iOS 15 or later:
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Open Settings
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Tap General
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Tap Transfer or Reset Device
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Tap Reset
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Press Reset Network Settings
iPhone iOS 14 or earlier:
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Open Settings
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Tap General
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Tap Reset
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Tap Reset Network Settings