Google AdWords advertisers who want to show ads on mobile phones had just one choice – text ads. Now they can also run banner ads – or as Google calls them “mobile image ads.” They are like regular banner ads but smaller.
All of the mobile image ads are keyword-targeted. You pay only when someone clicks on the ad (unlike many others that charge per impression or how many times your ad is viewed). There are four sizes of banners to choose from: (305 x 64), (215 x 34), (192 x 53), (167 x 30). The ads display the URL that they go to and the links must go to a mobile web page.