Configure Safari on the iPod or iPod Touch to use Bing, Google, or Yahoo!
If you tire of the default search engine in Safari on your iPhone or iPod Touch, you can always directly access the mobile site of a different search engine instead.
However, the search engine accessed via Safari's search box is easy to change. So easy, in fact, that some search engines may try to change it for you if you don't read all the onscreen prompts when you manually access one for the first time......
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