Nearly half of U.S. homes don't have a landline and rely on cellphones instead, according to a federal report out this week.
The number predictably has been climbing over the years, now surpassing even the households with both a landline and a mobile phone. And it's tracked by — of all agencies — the Centers for Disease Control and Prevention.
[For more of this story, written by Alina Selyukh, go to http://www.npr.org/sections/al...ts-are-tracking-them]
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