If I buy an iphone 3gs, and use one of the straight talk sim cards, will it work?

I have seen on the internet that you can have a normal iPhone 3gs, and use a straight talk sim card with it made for 3/3g/3gs for ATT, and it will work with unlimited talk/text/data plan for 45$ a month. I'm wondering is this true before I go buying everything?

Added (1). Also, how will I know if it is unlocked?

As long as your iPhone 3GS is not under any sort of lock via Apple, you should be good to go. All of the 3GS models are GSM, so you shouldn't run into any compatibility issues. If you decided to purchase and iPhone 4 or above, just make sure it's GSM and unlocked. Keep in mind there's some configuration that must be done, but the Straight Talk starter kit actually explains it fairly well.

You have to have an unlocked phone, i'm pretty sure

Straight Talk run off At&t Tower so the Phone doesn't have to be Unlock to work. It can be a At&t iPhone and still work on Straight Talk. Just as long as the Phone has a clean IMEI.

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