(AP) -- Federal regulators receive tens of thousands of customer complaints about wireless services every year, but don't do enough to follow up or to protect consumers who have problems with their mobile carriers, government auditors have found.

In a report released Thursday, the said the needs to ramp up oversight of the wireless industry and do a better job of enforcing consumer protection rules.

The GAO report comes almost four months after the opened a series of inquiries into wireless industry practices, including an examination of so-called "truth-in-billing" rules, which require phone companies to clearly describe charges on consumer bills.

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