The number of U.S. homes using only wireless telephones is growing, with two in every five households (41%) in the second half of 2013 reporting relying solely on cell phones, according to a National Health Interview Survey.

The number is up 2.8% from the second half of 2012 and 1.6% higher than the first half of last year but the increase is smaller than what's been observed in previous years. The report released this month presents the most updated estimates available from the federal government.

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