Why won't my iPhone 4 activate?

I bought this iphone from my friend last night and i keep calling the service center to get it activated and they can't figure out how to get it activated, resetted all network settings and the whole 9 yards, would I need a brand new SIM card all together or what's the problem? AT&T thanks guys

Go on www.apple.com or look on the package/direction's of the Iphone c

If its att, you need a active att sim, if its another carrier you would need to unlock it

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