At the end of last year, 7.2 percent of American households used only a cellphone, up from just 0.7 percent six years earlier, according to TNS Telecom, a research company.
Americans have not been eager to list their cell numbers in phone books. Consumers and privacy advocates balked at the idea in 2004, when most of the big wireless carriers said they wanted to compile a nationwide directory.
Cellphones may make it easier for people to reach each other, yet Americans are very guarded about whom they want calling them.
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