Jeff Allen tells us that for one client, mobile paid-search campaigns have generated 30% of the company's leads at a 40% lower CPL than their desktop and tablet-targeted campaigns. He provides details on some best practices and a couple of pitfalls to get started. One of the biggest, he writes, is enabling mobile targeting in a desktop campaign at the same bid rate. it will likely return worse results because marketers use desktop bids, which are probably higher than bids for mobile.