Can you use an iPhone without a data plan?

I've heard you can use the iPhone without a data plan by turning off the data on the phone before putting your SIM card in. My friend has been doing this for a while with a hand-me-down iPhone 3 he has. Does this also work with an iPhone 4? Another friend has given me her old iPhone 4 that I would like to use but I do not want to pay for a data plan when I could just use Wi-Fi. My carrier is AT&T and the phone is an AT&T phone as well.

No, AT&T audits their network and if they see any smartphone without a data plan on their network they will start pestering you, if you refuse to add one, they will cancel your service

your friend is likely lucky that they havn't been contacted yet, but they will eventually.

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