Can I use an old straight talk SIM card from my old iPhone in my other AT&T iPhone?

The iPhone that has the straight talk service already on it, is an iPhone 4. But it is also broken beyond repair.
But I also have an iPhone 4s in good condition that is has AT&T service on it.
My question is, can I use the straight talk SIM card from the busted iPhone4 in my iPhone 4s?

Is your Straight Talk service by T-Mobile or AT&T?
AT&T and T-Mobile are compatible, many other carriers are not.
Why not give it a try.
It can't hurt to try.

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