Telephone number porting activity: mobile to mobile in the U.S.
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https://www.statista.com/statistics/188496/telephone-number-porting-from-mobile-to-mobile-in-the-us-since-2003/
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The statistic depicts the telephone number porting activity from mobile to mobile since wireless porting started in the United States between 2003 and 2009. In December 2008, there were 1.5 million cases of telephone number porting from mobile to mobile in the United States.
该统计数据描绘了自2003年至2009年美国无线携号转网活动从移动网络到移动网络的演变过程。至2008年12月，美国已发生150万起从移动网络到移动网络的电话号码携号转网案例。
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