AT&T pressed its argument Monday against using devices that operate in the lower 700 MHz band, asserting in a blog post that "rigorous testing and engineering analyses" have proved that interference would impair call quality on its Long-Term Evolution network. Smaller carriers, such as U.S. Cellular, that own A-block spectrum have pushed the Federal Communications Commission to ensure that handsets can operate in the lower band. These carriers want phone-makers to make A-block-enabled devices in enough volume to bring down their price.

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