AdSense has introduced a contextual ad service for mobile website operators. However, your webpages should be mobile compliant to display AdSense ads on mobile devices. Google suggests:
If you don’t currently have a mobile website (and chances are, if you’re not sure, then you don’t have one), you can create one by rewriting your existing website in a mobile markup language, such as XHTML, WML, or CHTML. You’ll also need to make sure the layout of your website is properly formatted to display on mobile phones.
Only text ads are available now and they come in two sizes. The single size ad shows one ad and the double size ad displays two ads.
If you have a website that offers something to people on the road, you can make some additional money by making your website available to mobile users.
A list of some mobile websites is available here. Check them out to get ideas about the look and feel and contents of mobile websites. The W3C Mobile Web Best Practices Checker is here.
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