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A worker from Joyn uses a phone to send a message at the world's largest mobile phone trade show in Barcelona, Spain, Thursday March 1, 2012. The new messaging method introduced by the industry group GSMA, or Groupe Speciale Mobile Association, is dubbed "Joyn" and will be launched this year by operators in France, Germany, Italy and South Korea. They do it by offering messaging applications that let phone users chat for free on the carriers' data networks or Wi-Fi. (AP Photo/Emilio Morenatti)

Associated Press
A worker from Joyn uses a phone to send a message at the world's largest mobile phone trade show in Barcelona, Spain, Thursday March 1, 2012. The new messaging method introduced by the industry group GSMA, or Groupe Speciale Mobile Association, is dubbed "Joyn" and will be launched this year by operators in France, Germany, Italy and South Korea. They do it by offering messaging applications that let phone users chat for free on the carriers' data networks or Wi-Fi.  (AP Photo/Emilio Morenatti)
A worker from Joyn uses a phone to send a message at the world's largest mobile phone trade show in Barcelona, Spain, Thursday March 1, 2012. The new messaging method introduced by the industry group GSMA, or Groupe Speciale Mobile Association, is dubbed "Joyn" and will be launched this year by operators in France, Germany, Italy and South Korea. They do it by offering messaging applications that let phone users chat for free on the carriers' data networks or Wi-Fi. (AP Photo/Emilio Morenatti)
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