To change the DNS on your iPhone or iPad:

Find DNS IP addresses that you can use.

Here's a couple of them:

Google – 8.8.8.8; 8.8.4.4
OpenDNS – 208.67.222.222; 208.67.220.220
Open Settings → Wi-fi
Tap on the 'i' icon to the right of connected WiFi network's name
Scroll down and tap on DNS
Enter any of the given DNS addresses as is.
Restart Wi-fi on iPhone.

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