Will att gophone sim work in iphone 4?

I'm looking into buying an iphone 4 but I have a question before I buy it. If I cut my ATT gophone sim card to a micro sim will it work in the iphone 4 the same way it worked in my gophone?

Yes it will. However, you are more likely to pay extra for data.AT&T will detect it as a smartphone and will force you to pay more.

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