To use a SIM Card with a different phone service than it was originally programed for, you will have to unlock the phone. Phones come locked to a specific service provider and/or country. In theory, you can contract your phone provider and request an unlock code. In practice, many providers refuse to give these codes out.
There are also services online that will provide these codes, or let you ship your phone to them to be unlocked, for a fee. One such site is: http://www.unlockcellphone.com/ - but there are many more. Do a google search for "unlock cell phone" and you'll find quite a few links... find the one that has the best price for your phone model.
Of course, there's a chance the card will work as-is if you're still using the same phone provider. But with all the changes AT&T has gone through, I wouldn't count on it.
Dyllan
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