Why would update to iOS 4 lead to a loss of 3G network coverage?

my wife's 3G no longer has 3G network coverage after the iOS 4 upgrade. My 3G on the other hand has experienced no disruption in 3G coverage.
We've done restores, reset...any ideas?
perplexed in Dallas

I would do the update first since if something happens you will not have to reinstall stuff like songs etc.

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