How to activate an iPhone 3 without a SIM card?

So I bought an Iphone 3g a while ago to use as an ipod (no phone feature) and I guess the guy I bought it from tried to jailbreak it and I didn't know that so I tried to get the 6 update, which ended up making me have to restore it to factory settings. When I tried to enter the settings when I first turned it on, it tells me I need to get a valid SIM card to use it. I was just wondering how to activate it without a sim card?

The iphone 3 can't update to ios 6.4.2.1 is the last firmware it can get.
you can rejailbreak it with 4.2.1 to get passed activation screen

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