The rapid growth in cell-phone-only households is pressuring public opinion researchers to adapt their surveying methods, which are based heavily on telephone interviews of people with traditional landline phones.
The number of households using only a mobile phone doubled in less than two years, with the rate rising faster among certain groups, researchers found.
For adults in school, the rate of mobile phone use tripled in that time. Also, the number of people using only mobile phones was growing faster among several groups -- including young adults, those people living with unrelated roommates and those people living alone.
Public opinion research, such as government surveys, market research and political polls, faces obstacles in dealing with the cell-phone-only crowd.
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