67362 external_news 1308310493 1475893483 Unsatisfied with the performance of AT&T's mobile network and coordinated through social media, a growing group of iPhone users may try to cripple the network on Dec. 18 by simultaneously using high-bandwidth applications. But Patrick Traynor, assistant professor in Computer Science, says service providers face a tremendous challenge in upgrading their networks to meet exploding demand.

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