Change dns settings on PlusNet internet?

My friend has plusnet internet, and she wants to add restrictions so her son can't look at things he shouldnt be! What's the easiest way of doing this? I've heard changing the dns to a different one can add the restriction
He connects via Wi-Fi on his iphone. Anyone know how to get to the dns settings of the router?

Tell them to try OpenDNS. They can help set up DNS that gives a parent control of what sites can be accessed. Of course, one had to have admin rights on every PS that you want to set this stuff on… It is a PC setting, not a router thing…

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