National Health Interview Survey Early Release Report: “Preliminary results from the January-June 2008 National Health Interview Survey (NHIS) indicate that the number of American homes with only wireless telephones continues to grow. More than one out of every six American homes (17.5%) had only wireless telephones during the first half of 2008, an increase of 1.7 percentage points since the second half of 2007. In addition, more than one out of every eight American homes (13.3%) received all or almost all calls on wireless telephones despite having a landline telephone in the home. This report presents the most up-to-date estimates available from the federal government concerning the size and characteristics of these populations.”