Removing DNS settings from your iPad / iPhone / iPod
Go to Settings > Wi-Fi.
Find your Wireless connection which has the tick or checked mark and click on the blue 'i' icon.
Note: On older version of iOS, the icon should be a blue arrow.
You should now be in your Wi-Fi details page. Tap on DNS and delete the existing DNS address on your device.
Now tap on the Wi-Fi button at the top left of your Wi-Fi page to save the changes and go back to the Home screen.
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