Change iPhone’s Wi-Fi DNS Settings to Connect to the Internet -
Quickly Fix DNS Settings on the iPhone
* Go to Settings.
* Select Wi-Fi.
* Chose a network.
* Select the blue arrow next to the network you are connected to.
* Select DNS.
* Change the IP Address to 208.67.222.222
Correct DNS settings (using OpenDNS)
If using your router as the DNS server fails, or if you prefer to use a public DNS server, I highly recommend using a DNS server hosted by OpenDNS. OpenDNS is a safer, faster, and smarter way to navigate the internet. To use OpenDNS as the DNS server, change the IP Address to 208.67.222.222 or 208.67.220.220
DNS 208.67.222.222