Plunging second-quarter profits at most prepaid-wireless providers put a spotlight on the challenges facing companies such as MetroPCS, Leap Wireless, T-Mobile USA and U.S. Cellular, according to a report. "It is absolutely imperative that companies like ourselves focus on our cost structure," said MetroPCS Chief Financial Officer Braxton Carter. The price wars escalated anew with Page Plus Cellular's unveiling of a $39.95-per-month unlimited voice and texting plan.

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