Yes, you read that correctly. Implementing a desktop-focused campaign can get you a better CPA – not alone, though.
Every day, users search on the go with their mobile devices. You never know where people will be, so you can’t lock down one postal code or small area around your store. People search from everywhere, which is completely different from a desktop search. That’s why we need to be able to focus on mobile and desktop separately, and by making both a desktop-focused campaign and a mobile-focused campaign, we can achieve this.
AdWords accounts should be taking advantage of the ability for device segmentation. You should have campaigns that focus on both desktop and mobile search. You can do this by adjusting campaign settings so the mobile bid adjustment is set to -100%; this will make the entire campaign’s ads and keywords never show on a mobile device.
The next step is to clone that campaign and set up mobile-specific ad extensions, bids, and ad copy (and don’t forget landing pages if you don’t have a responsive website). This ensures that your keywords only activate the mobile ads in this campaign.
Now you have one campaign bidding for desktop and mobile at the same time and can focus your ad copy to speak to mobile users. In addition, you can see the value come from each device-segmented campaign at a higher level, whereas before you’d need to look at a segmented view in AdWords, which can be a bit of a mess to look at.
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