It'd be great if the DDG search results page was optimised for iPhone (and iPad?) viewing.
This is really easy to do: you just put one meta tag containing viewport size information.
(You can also add one line of CSS that prevents iOS WebKit resizing text but that depends on what you're trying to achieve).
There's a lot of info on Apple's Safari Dev Centre website, but here are two articles that sum things up.
I'm happy to help if I can.