If you've chosen to show ads on iPhones and other mobile devices with full internet browsers, you can now target specific mobile devices or carriers.

This feature makes it easier for you to reach the right users if you have a carrier- or device-specific message. This includes landing pages that have been optimized for a specific device, billing relationships with certain carriers, or mobile apps developed for a specific platform. For example, if you sell iPhone cases, you can use device targeting to ensure that users with Android phones won't see your ads.

Starting today, we're also making sure that ads linking to mobile app downloads will automatically appear only on devices that offer those apps. Plus, the ad will display a 'Download' link instead of a URL. Simply include 'itunes.apple.com/' or 'market.android.com/' followed by the app name in the ad's visible URL, and it will automatically display as 'Download iPhone App' or 'Download Android App.'

We hope these new features will deliver a better, more relevant user experience.