Ans. Call-only ads and call extensions are two different types of ads that can help you drive phone calls to your business. Here's the difference between the two: Call-only ads are standalone ads designed to drive phone calls directly from the ad. Call extensions are a feature that can be added to existing ads to encourage phone calls. Call-only ads only appear on mobile devices, while call extensions can appear on both mobile and desktop devices. Call-only ads have a phone number and ad copy focused solely on driving phone calls, while call extensions add a phone number to existing ads.