For the past 5 years, data from the National Health Interview Survey (NHIS) has provided the federal statistical system with the most up-to-date estimates of the prevalence of households that have substituted a wireless telephone for their residential landlne telephone. Conducted by the National Center for Health Statistics of the Centers for Disease Control and Prevention, the NHIS is an annual face-to-face survey that collects comprehensive health-related information from a large sample of households representing the civilian noninstitutionalized household population of the United States. Starting in 2007, the NHIS included questions to identify households who receive all or nearly all of their telephone calls on wireless telephones despite having working landline telephones. The size and characteristics of this population should be of interest to telephone survey researchers, for two reasons: 1) This population may be less likely to respond to a landline survey call, and therefore this population may be underrepresented in single-frame landline surveys and in dual-frame surveys that supplement a landline frame with a wireless frame that is screened for wireless-only households; and 2) this population may have characteristics similar to the wireless-only population, and when a sample of this population does participate in a landline survey, their data could be disproportionately weighted to account for noncoverage of the wireless-only population. This presentation will use 2007 NHIS data to describe the telephone ownership and use characteristics of U.S. households, and then will focus on the characteristics of households (and persons living in households) that have a landline telephone but receive nearly all calls on their wireless telephones. Finally, this population will be compared and contrasted with the wireless-only population.