Growth in the volume of text messaging is slowing sharply, just as new threats emerge to that lucrative source of wireless carrier profits.
While U.S. cellphone users sent and received more than 1 trillion texts in the second half of 2010, according to CTIA, a wireless industry trade group, that was just an 8.7% increase from the prior six months. It was the slimmest gain since texting exploded last decade.
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