Umm, I have a v1 iPhone on AT&T with no data plan.
Now to clarify, I bought my iPhone on eBay and just unlocked it and put my SIM card in and haven't had an issue. I added the data plan for a few months, but needed to save some money so I called up AT&T and told them I had an unlocked iPhone and wanted to turn the data plan off, and they complied with my request.
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