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How does Google detect that you are using a cell phone when you go onto their site?

Like, when you are on the internet on your mobile phone and you go to Google, it senses that you have a cell phone, and sends you to a different web page. I want to know how you do that.

Answer :
- Its the cookies and the browser you are using. It could also be your IP address but i'm not sure. Google reccognizes your using mobile web, and re-directs you accordingly
- Google simply picks the User Agent of your phone and matches it with predefined user agents in its database.
Wurfl is one such database. Just goto http://wurfl.sf.net
Here you will find api's to find the device from which an http request has come. You can then respond with the correct website accordingly.

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