Using newly collected data on recent dual frame surveys from a large number of survey organizations, this article discusses the current cost ratio of cell phone random digital dial (RDD) interviewing versus landline RDD interviewing, shows the recent trends in costs and cost ratios, and examines some of the key factors that cause variation in the cost of cell phone interviewing versus landline interviewing. While the overall cost of telephone interviewing has increased substantially over the last several decades, it is now not uncommon for a dual frame RDD (DFRDD) survey to report cell phone interviewing to be equal to or even lower in cost than landline interviewing.