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Sitem Global per la Telefonia Movable, GSM (corti: Groupe Spécial Mobile) es la norma plu poplal de mundo per la telefones movable. Plu ce 2000 milion personas en plu ce 212 paises e areas usa el servi GSM. GSM es presente a cada parte de mundo e es plu comun per operatores per ofrer roaming internasional. Donce, usadores pote usar los telefones a stranjer. GSM es diferente ce el presedentes a causa de el canal e sinia e parla es dijital, donce es considerada la jenera secondo de sistema de comunicaciones movable.

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