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Wireless customers who subscribe to tiered service plans that offer varying degrees of data amounts to access the Internet and related connection based services are considerably less satisfied with their carrier's customer service than are those with unlimited data plans, according to the J.D. Power and Associates 2012 U.S. Wireless Customer Care Full-Service Performance StudySM--Volume 2 and the 2012 U.S. Wireless Customer Care Non-Contract Performance StudySM--Volume 2, both released today. More