Download: Why No Cellular Data Network Tab on iPhone 3GS 4 4S 5 iOS 6.0 6.0.1
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Explanation why you don't have the Cellular Data Network Tab on your iPhone 3GS, 4, 4S or 5 on iOS 6.0 and up. Solution is to jailbreak your iPhone and install TetherMe via Cydia or upgrade to iOS 6.0.1 for those not on the AT&T network towers i.e. TMobile network towers.