Assessing the Cell Phone Challenge to Survey Research in 2010: “One-in-four U.S. households now have no landline telephone, considerably more than in the early 1960s when telephone surveys were considered infeasible because so many households were unreachable by telephone. Unlike the 1960s, however, most of those without a landline today do have telephone service, in the form of one or more cell phones. Very few households, according to government estimates, cannot be reached at all by telephone. Yet pollsters and other survey researchers who use the telephone as the principal means of reaching potential respondents face a difficult decision as to whether to include cell phones in their samples. Doing so adds significantly to the cost and complexity of conducting surveys at a time when respondent cooperation is becoming increasingly difficult to obtain.”