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^some nav app needs data to work. Also most people uses 3g in places that don't have wifi such as doctor's office, restaurant and outing with friends. Say you are out with your friends eating and you guys suddenly decide to watch a movie, like most restraurant there is no wifi. You can save the day and use 3g to check movie times. Also useful when you are a passenger and the driver is either really dull or the car is really dull... you can pass the time browsing RS.
The use are endless, you really can't appreciate its usefulness until you actually use it. Wifi is not everywhere, you have to be near or around the access point.
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