Shifts in wireless phone usage, including smartphone and texting use, as well as an increase in the percentage of wireless calls being made and received inside buildings, has led to a halt in overall call quality improvement, according to [pdf] the J.D. Power and Associates U.S. 2011 Wireless Call Quality Performance Study, Volume 1. The study finds the percentage of wireless calls made indoors has increased 40% during the past eight years, to an average of 56% in 2011 from 40% in 2003.
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Wireless Call Quality Stops Improving
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