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Switching between Wi-Fi and data is a hassle. Again, no wonder so many people jailbreak their iPhones in order to gain simplified controls over their networking functionality. Bluetooth is the same, as is the GPS function. All of these settings churn up battery life, and often want to be toggled on and off as and when user's desire. With one swipe of the finger, the notification center could easily house the array of switchable items. If jailbreak applications perform this feature, why won't Apple just implement the feature itself?
Image credit: ZDNet.