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.