Will my ATT gophone sim card work in a old iphone 3gs?

If i buy an unlocked ATT iphone 3gs off of ebay can i put my att sim card in the iphone and make calls and such

I have an old iPhone 3 and the GoPhone sim cards work fine.

Yes it will. However if you have data you will not be able to use the internet unless you get the 1gb for 20 dollars.

Of-course, You can use it.

  • Will my GoPhone work with the iPhone 3GS? So, I got a GoPhone around 2 years ago and I'm still using it. I currently use the $25/month plan. I have a spare iPhone 3GS at my house. Can I put the SIM card in the iPhone and have it working? Can I also get data because my current plan doesn't have it? Also, if it can be working, what will I need to do to have it working? The iPhone is on iOS 6.1.3.
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