Unfortunately a Go Phone won't work in the areas not covered by AT&T, and there is no way to pay for roaming separately. You can see the coverage map here, just make sure to select Go Phone on the left.
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so there's no roaming in nebraska or wyoming?? i checked out the coverage map for the go phone service and it came back as 3 rd party. so i would assume that they have a roaming agreement in place for go phone service now??? and people have said on other forums thay the go phone will roam in those areas. maybe they just put roaming agreements in place??