How to activate my Iphone 4? - 2

My dad has a family plan with At&T. He had a I phone 4 and I had a 3GS. He upgraded to the iphone 5 and gave me the iphone 4. He called At&T to switch my 3GS to the 4 and they sent a sim card. I put in the new sim card and it says no serice. What do i do now?

The phone should have activated with the new SIM. I would call AT&T and tell them the SIM that was sent isn't working.

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