Intensified relations between Apple and Google gave more credibility to the rumor that Bing is going to replace Google as a default search engine in mobile Safari on iPhone. Here comes a new evidence found in the iPhone OS 4.0 where Apple has replaced the “Google” branding from the Safari Search keyboard and replaced it with “Search”.

In iPhone OS 3.1.3, the button is still branded with Google when you type something in the search field of iPhone Safari. Screenshots from both 3.1.3 and 4.0 firmware after the jump…

iPhone OS 3.1.3 FeatureiPhone OS 4.0 Feature