I bought my iphone 4 today and i want to give my 3G to my husband to use as a phone with only wifi... (Don't ask me, this is what HE wants -he refuses to pay for data) Anyhow, I updated it to iOS4 which incidentally has a Cellular Data ON/OFF toggle in the settings. Is it clear if this is enough? anyone have a hold on this? do I need to unlock or jailbreak it or anything along those lines? any help would be greatly appreciated.