Growth in the number of wireless customers looked like the solution for a while, but only as long as the U.S. market was less than saturated.

无线用户的数量增长看起来是暂时的解决方法，而这也只是因为美国市场还处于欠饱和状态。

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Wireless devices, however, introduce a number of different factors that make the transmission of this signal a lot more difficult.

而无线设备面临很多不同的因素可以使得信号的传输更加困难。

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The number of wireless subscriptions has now reached 5 billion worldwide, earlier than expected, not least because so many SIM CARDS now sit in machines that communicate with other machines.

目前，全世界的无线用户数已经达到了50亿，这要比预计的要早，最主要是因为太多的手机SIM卡被装入了与其它设备进行联络的设备中。

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These include Sierra Wireless, Novatel Wireless, and a number of wireless chipset vendors.

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At Verizon Wireless, the number of text messages sent by its retail customers dropped from an average of 2, 110 in the third quarter of 2010 to 2, 068 in the fourth quarter, then reached 2, 104 in the first quarter of this year.

WSJ: Cellphone Carriers Face Pressure Over Texting

Vodafone recently joined Verizon Communications as a major investor in Iusacell, Mexico's number two wireless operator.

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