When a user enters a shopping-related search, a commercial format that displays products in a single unit may appear above organic search results. This ad unit is labeled as a ‘Sponsored’ and displays rich product images, prices, retailers, and more. This mobile shopping experience will be available in all markets currently serving Product Listing Ads.
If you want your Product Listing Ads to appear on Smartphones then you’ll need to upgrade your Product Listing Ads to “enhanced campaigns” and make appropriate bid adjustments in your AdWords account. Enhanced Campaigns enable you to easily manage bids across devices, locations, and time of day.
Once you’ve made the edits required your Google Product Listing Ads will be automatically eligible to be displayed in search results on smart phones.