According to the latest report released by the wireless association CTIA on Thursday, the number of SMS messages sent and received in the United States has been declining year by year. The survey results show that the number of SMS messages sent and received has dropped from 2.3 trillion in 2011 to 2.19 trillion last year, a decline of 5%. One of the main reasons is that the SMS service has been occupied by a variety of social chat applications, such as Apple's iMessage, WhatsApp, Viber and BBM, etc. This chat service that can send and receive pictures and voice messages at the same time is favored by more and more consumers.
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