) -- Here's one reason


(GOOG) - Get Report

is in a

mad rush to get an Android device in people's hands

: The arrival of mobile Bing.


(MSFT) - Get Report

unveiled its Bing search application for


(AAPL) - Get Report

iPhone Tuesday, aiming squarely for Google's popular mobile search service.

Not only does Bing's iPhone search page feature the company's attractive photo backdrop, but just like Google, Microsoft's app has a spoken-command function that allows users to say an address or a keyword that they want searched.

Voice recognition is an area where Google has been remarkably accurate. By eliminating the need to type, spoken commands give users an easier way to input search terms. Bing could steal some of Google's thunder on that front.

Google had an early lead in mobile search, especially on the iPhone where it linked GPS location with Google maps and local search results. If there is a clear disadvantage for Microsoft, it is that Apple iPhone users have to download the Bing application through iTunes. Google's search, on the other hand, is pre-loaded on the iPhone.

Google's touchscreen-driven Android system and Apple's iPhone have caught on at a time when leaders like Microsoft,

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have had trouble retooling their operating systems to accommodate the trend.

Eager to capitalize on this changing of the guards, Google is working with mobile phone maker


to offer its own

Google Phone

-- dubbed Nexus One -- directly to consumers. As


first reported in October, the move was a bold attempt by

Google to disrupt the wireless status quo by pushing unlocked phones that bypass telco controls


Unwilling to allow telcos to determine what search engine would run on phones, Google pushed its own Android operating system to ensure that its search service would be front and center.

Microsoft could take some steam out of the Google machine if Bing becomes available for use on Android devices.

-- Written by Scott Moritz in New York

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