63% of American adults living in shared accommodation have no landline

"More than three in five adults living only with unrelated adult roommates (62.9%) were in households with only wireless telephones. This is the highest prevalence rate among the population subgroups examined.
More than two in five adults renting their home (43.1%) had only wireless telephones. Adults renting their home were more likely than adults owning their home (14.0%) to be living in households with only wireless telephones.
Nearly half of adults aged 25-29 years (48.6%) lived in households with only wireless telephones. More than one-third of adults aged 18-24 or 30-34 (37.8% and 37.2%, respectively) lived in households with only wireless telephones.
As age increased from 35 years, the percentage of adults living in households with only wireless telephones decreased: 23.9% for adults aged 35-44; 14.9% for adults aged 45-64; and 5.2% for adults aged 65 and over. However, as shown in Table 2 and Figure 2, the percentage of wireless-only adults within each age group has increased over time.
Men (24.5%) were more likely than women (21.3%) to be living in households with only wireless telephones.
Adults living in poverty (36.3%) and adults living near poverty (29.0%) were more likely than higher income adults (19.6%) to be living in households with only wireless telephones.
Adults living in the Midwest (25.6%), South (25.4%), and West (22.2%) were more likely than adults living in the Northeast (15.1%) to be living in households with only wireless telephones.
Hispanic adults (30.4%) were more likely than non-Hispanic white adults (21.0%) or non-Hispanic black adults (25.0%) to be living in households with only wireless telephones."
Source: Wireless Substitution: Early Release of Estimates From the National Health Interview Survey, July-December 2009, by Stephen J. Blumberg, Ph.D., and Julian V. Luke, Division of Health Interview Statistics, National Center for Health Statistics, May 2010