Which network has the greatest 3G footprint in the United States?

The answer, it seems, depends on whose advertising you believe: that of operator AT&T or rival Verizon (News - Alert) Wireless.

AT&T is answering Verizon's "slams" on its wireless phone coverage in a new "Rethink Possible" sales pitch, the Associated Press reported.

AT&T (News - Alert)'s latest ad campaign, which made its debut during the Masters golf tournament, "touts grand visions for untethered Internet access," telling audiences how AT&T can help them multi-task, according to the AP. The campaign, comprising five ads, "mix[es] whimsical fantasy - childlike drawings prancing through a city - and voiceovers urging people to 'Explore, try, do,'" the AP story said. 

Meanwhile, Verizon Wireless is brewing up a campaign of its own that targets business customers. Its current consumer campaign attacks AT&T's wireless coverage.

Lately, the ad war seems to have taken a bit of a serious tone, although the two operators "agreed late last year to drop the cases that accused each other of lying in ads," according to the AP.

Still, AT&T announced in late January it would spend an additional $2 billion to improve its network this year, said the news report.