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Forget a network on iPhone or iPad
To forget the network that you're currently using:
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Go to Settings > Wi-Fi.
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Tap the info button next to the network you're using.
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Tap Forget This Network, then tap Forget to confirm.
To forget a network that you've joined before but aren't currently using:
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Go to Settings > Wi-Fi.
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Tap Edit in the corner of the screen to see the networks known to your device.
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Take either of these actions:
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Tap the delete button , then tap Delete.
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Or tap the info button next to the network, tap Forget This Network, then tap Forget to confirm.
Forget a network on Mac
Follow the appropriate steps, depending on which macOS you're using.
macOS Ventura or later
To forget the network that you're currently using:
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Choose Apple menu > System Settings.
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Click Wi-Fi in the sidebar.
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Click Details next to the network you're using.
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Click Forget This Network, then click Remove to confirm.
To forget a network that you've joined before but aren't currently using:
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Choose Apple menu > System Settings.
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Click Wi-Fi in the sidebar.
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Scroll down on the right and click Advanced to see the networks known to your Mac.
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Click the more button next to the network, choose Remove From List, then click Remove to confirm.
Earlier versions of macOS
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Choose Apple menu > System Preferences.
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Click Network.
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Click Wi-Fi in the sidebar.
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Click Advanced to see the networks known to your Mac.
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Select the network, then click the remove button (–) beneath the list. Click Remove to confirm.
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Click OK, then click Apply.
Please see Apple's support article here for more assistance.