Switching between iphone and samsung?

I currently have an iphone 3gs and a samsung captivate. They are both from AT&T. I currently only us the iphone 3gs.
If i switch sim cards will it mess with the way our bill is set up?
Can i switch sim cards between these phones?
Will i lose my messages if i switch between these phones?
Should i switch to my samsung instead of the iphone 3gs?

1st. If you are unable to switch your SIM card shape would either be diffrent. Or you will get a error message on your screen. Second no it will not screw up your bill.

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