Can I use my old ATT/iphone sim card in a new iphone?

So, I want to get a new iPhone and put my first AT&T/iPhone sim card, the card that came in my first iPhone into.....will this work? normal activation thru iTunes? and tips, tricks, suggestions, etc.
thanks in advance,
Eric

You have to activate the iPhone because you have to active your iPhone account. This isn't just another phone that you can switch SIM cards between and it work.
I don't know what "back door" you're talking about but I hope that you would know by now the iPhone is not another regular cell phone. But it most certainly does work with any AT&T SIM.

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