Survey researchers beware: CDC says 1 in 5 households has only a cellphone

The CDC released results from a National Health Interview Survey that says that one in five American households has only wireless telephones.  This number is almost double from a similar survey two years ago.  What I find most intriguing are the demographic differences.  People who live only with roommates and young people are the most likely to only have wireless phones.  This figure says it all:

As people 30 and younger age, that curve will move right.  There kids will inivitably grow up in households without landlines as well.  When over 50% of households have only wireless phones, will telephone surveys go the way of zip drives and fax machines?  The good news: mail surveys are typically significantly cheaper and aren’t as open to response bias.

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