Initial results from the July-December 2008 National Health Interview Survey (NHIS) indicate that the number of American homes with only wireless telephones continues to grow. More than one of every five American homes (20.2%) had only mobile phones during the second half of 2008, an increase of 2.7 percentage points since the first half of 2008.

In addition, one of every seven American homes (14.5%) received all or almost all calls on wireless telephones, despite having a landline telephone in the home.