On my note 3, I turn off my mobile network when I'm connected to a wifi network. For 2 reasons. So that I don't use mobile data, and to save battery. But if I'm connected to wifi, and have a strong signal, will it matter if mobile is on or off? Will it use any more battery than if mobile were off? If it won't make any difference, I would rather keep mobile on for sending and downloading mms messages.

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