So then if he wants to turn mobile data off he should just use the airplane mode, right?
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Sure, if you turn on Airplane Mode it'll turn all radios off, which includes cell reception and network data. Some people are on a restricted data plan, so the general rule of thumb is, if you're not browsing the intenet or using apps that require data, then you should turn your network data off, but you still would want your cell reception on to receive calls and text.
So I think you're really confused. I'm not sure if you're just trolling us or really don't know what the difference between data accessed via wifi and data accessed via carrier network?