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Apple iPhone 3GS

The Dallas, Texas-based carrier has refused to approve SlingPlayer Mobile, which broadcasts bandwidth-intensive TV programming to smartphones over the Web, would slow down its network.

But the company changed its mind about bandwidth-intensive apps after the Federal Communications Commission began a wide-ranging investigating into anticompetitive behavior and industry practices in the telecom sector, including Apple's decision to block a Google calling program last year.

In October, AT&T started allowing voice software that ran on its 3G network.

Federal regulators are currently working on "net neutrality" rules that would prevent companies such as AT&T from abusing their power and deciding what kind of Internet traffic is allowed to pass or blocking customers from cheaper Web services that compete with its own business.

Sling Media, which launched a Wi-Fi-only iPhone app last May, has submitted an updated version with 3G capabilities, pending Apple's approval.