Can you buy an IPhone 3G (not 3GS) on pay as you go?

Well the title says it all. I want to buy on pay as you go an IPhone 3G (again, not a 3GS). Okay yeah, just wondering.
Um, I'll choose best answer!

Yes, you can buy either and use it on AT&T's GoPhone plans. However, you will need to change the APN settings for your cellular data to work. This applies to any iPhone you're trying to use with GoPhone. To do this, connect your iPhone to Wi-Fi and go to unlockit.co.nz from the iPhone. Select create APN and select AT&T (PAYG) as the carrier. Install the profile, and you're good to go! I have done this myself, so I know for sure that it works.