Lets say that I turn off "Cellurar" in the settings screen. Should that be enough for the iPhone to stop using time of the cellular data, or should I have to turn all the apps that use cellular data? I don't need to use any of the very small amount of time of my data plan since I am always at work or home where I use Wi-Fi. Well, maybe I would use the GPS a couple of times a year My wife and I have 2 iPhones with the minimum data possible (around 500MB shared, I believe). Anyway, we just text and voice with the iPhones since we got tired of the very small screens and keyboards of our old "dumb" phones.