Google has been accused, and later admitted, that they bypassed the security settings of many users that chose to use the Safari web browser. The company used a loophole in the security setting to get around privacy settings that users thought would protect them from cookies.
Cookies are the small text files that browsers automatically store if the privacy settings are not on that record information about which sites are visited and in some cases are needed to access online services. Although Google admitted that this happened, they say that the story manipulates the actual scenario quite a bit.
Apple created the Safari browser that is found on the iPhone. The browser is set up to only allow cookies to be stored from the web page that a user is actually on and not from advertisers or other third parties.