is wifi essential for the iphone 4 or does it work of the micro sim?

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Bri'sGirl

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I know thats what you need for the ipod touch and for that I know you need to hook up and router to your modem and stuff
but was just wondering does that still apply for the iphone 4 or is the micro sim enough
10 for the best answer
thanks
I mean obviously for accessing the internet
 
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