In a report Adweek notes that in meetings with add agencies "Google has presented a new option to show different ads in response to searches made from iPhones. The change, expected to be implemented shortly, means advertisers will be able to create an iPhone ad group as part of their regular search campaign".
The iPhone is unique in that it presents a standard desktop web experience as opposed to a mobile centric view by default. Many mobile phones present a simplified version of web pages using technologies such as WAP or Japan's imode mobile web.
Even thought there are Mobile ad networks like JumpTap and AdMob that are into iPhone ad market, the entry of Google is significant given that Google maintains a dominant lock on Internet advertising where even Microsoft has been stymied to challenge.
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