Total global mobile voice minutes increased tenfold between 2001 and 2010 to 1.6 trillion last year, according to Wireless Intelligence. The research firm, a unit of the GSMA, said that is equivalent to an increase from three to five hours of call time per user per month across the world, and has come about as a result of a simultaneous drop in the effective price per minute of calls to a quarter of what it was nine years previously. source: Wireless Intelligence statement
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