Re-activating old iPhone won't work?

I stopped using my iPhone around January of this year, and now I'm trying to switch back. I restored it to the factory settings and now am trying to activate it again, but it won't prompt the activation screen in iTunes. The phone is still on the same account it was on when we deactivated it, but do I still need a new sim card? They left the old one in the phone so I'm using that one right now.

I'm fairly certain you will need to get a new SIM card, which will bring up the AT&T activation screen when the iPhone is connected to iTunes with the new SIM card inserted.

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