I turn my 3G and wifi on/off as I need to use the data. I have no need to keep the 3G on in my pocket, and it takes a fraction of a second to select 3G to on and for it to connect to the network. I notice a SIGNIFICANT increase in battery life. When I first bought the phone I was lucky to go a day, now I go about two with constant text messaging and frequent gaming and data usage. To me it makes no sense to leave it on!
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