This is an actual result of a PPC campaign for one of our new clients. The best conversion rate was from a Call Only campaign via mobile devices at a 32% conversion rate at $21/call. Google Search campaign resulted in a 7% conversion rate that includes desktop, mobile and tablet devices. Yelp converted at a 25% conversion rate. Google's new Local Services Ads offers "Google Guaranteed," which costs $35/call with an 89% booking rate!