How to use iMessage on an iPhone 3g without service?

I know on iPods and iPads you can use iMessage via Wi-Fi and email, but how doi do it on an iphone 3g? A friend of mine git a new iphone so he gave me his old one, and I wanted to use imessage but there's currently no cellular service

You can use Wi-Fi

If the iPhone 3G ever got iMessage then it would work on Wi-Fi. I'm not sure if it did though, my old iPod Touch gen 2 never got it.

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