AT&T (NYSE: T) asked the federal court in Atlanta late last night to force Verizon (NYSE: VZ) to immediately pull its ads, which they are saying could cause “irreparable harm.”

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Here’s the argument: AT&T is saying that the side-by-side coverage maps that are in the ad are misleading—not because they are untrue—but because the “white space” could be interpreted as having no coverage in those areas (when in reality it means no 3G coverage). AT&T’s Mark Siegel tells USA Today: “If customers think they can’t make calls in the vast majority of the country…that could do us irreparable harm.” UPDATE: This afternoon, AT&T appealed directly to consumers, saying “recent ads from Verizon are so blatantly false and misleading, that we want to set the record straight about AT&T’s wireless data coverage.”

AT&T claims its 3G network covered 233 million people, or 75 percent of the U.S. population, and its slower EDGE data service covers 303 million people, or 96 percent of the population. When strictly talking about 3G coverage, it sounds like AT&T does in fact cover fewer people than Verizon Wireless, which says on its web site that its 3G network is available to 284 million people across the country.