Wikipedia could become one of the default search options in the iPad, iPhone and iPod touch versions of Safari, investigation hints. The reference is buried in the code of the iPhone 3.2 SDK, alongside the two earlier engine options. While Safari defaults to Google at present, users can also toggle Yahoo search for a different set of results.

The Wikipedia option would be unusual given that the site does not link to outside webpages, but rather articles from its own user-created encyclopedia. The site also has its own official iPhone app. It could make more sense for Apple to include other major search engines, such as Bing or Ask.com; future updates of the iPhone SDK may in theory expand the selection. Apple and Google have become increasingly antagonistic towards each other in recent months.