The National Health Interview Survey (NHIS) is the most widely cited source for data on the number of American homes that only have wirelesstelephones. Every 6 months, the National Center for Health Statistics (NCHS) releases a report with the most up-to-date estimates available from thefederal government concerning the size and characteristics of the wireless-only population (1). That report, published as part of the NHIS Early ReleaseProgram, presents national and regional estimates. For example, the latest results show that more than one out of everysix American homes (17.5%) had only wireless telephones during the first half of 2008.