Preliminary results from the July-December 2011 National Health Interview Survey (NHIS) indicate that the number of American homes with only wireless telephones continues to grow. One-third of American homes (34.0%) had only wireless telephones (also known as cellular telephones,cell phones, or mobile phones) during the second half of 2011-an increase of 2.4 percentage points since the first half of 2011. In addition, or nearly one of every six American homes (16.0%) received all or nearly all calls on wireless telephones despite also having a landline telephone. This report presents the most up-to-date estimates available from the federal government concerning the size and characteristics of these populations.
Source: cdc.gov