How to use the iphone 3gs without a data plan on att?

I got a 3gs and I put a basic phone sim in it but I think they will find out. How do I use this thing without a data plan?

The system *will* spot your sim card in it & add a data plan sooner or later. Bottom line is without a data plan there are parts of a smart phone that won't work. Don't want the data plan, use a phone that wasn't made to use it.

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