Q: Is it Possible to Use a Regular 3G Sim in the Iphone 4 after JB ?

I am an AT&T subscriber. I have a regular 3g phone. I plan to purchase iPhone 4, but I don’t want to pay the high prices of the data and voice plan. I want to keep my same plan. I just want to have the extras that the iPhone has to offer, such as the Wi-Fi , Face-time . Is it possible for me to use my
current SIM card in the iPhone 4 and/or 3GS after it is JailBroken? My current phone is the LG Xenon.
Thanks in advance.

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