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Do the new att sim cards work in the cingular phones?

I am thinking that they dont, but has anyone tried this before?

Public Comments

1. contact att and ask
2. Cingular is now.........THE NEW AT&T. Well, that's what they said on my last bill. I want my, I want my, I want SNET.
3. Yes it should perfectly. A at&t sim card should work in a Cingular phone. A sim card registers the phones Serial number to the network. If the serial number is in Cingulars system it should work........ Cingulars and at&t's sim cards register to the same towers.