With apple iphone 4 facetime?

I just bought an apple iphone 4 from my friend. I haven't set it up with a mobile carrier yet, but I was wondering can you still facetime without having it in service. Just via Wi-Fi? Or do you HAVE to have it set up with a carrier to be able to use the facetime app?

You can still facetime via Wi-Fi: D

You can use it with Wi-Fi.

Facetime and imessage both work fine over Wi-Fi

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