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No one should leave 3G on their phone unless they plan on using it at that moment. Always switch to Edge when you do casual reading or playing with any of the games. Also switch off WiFi unless you are using it. They cut the battery time more than half. I can go all day at work with my iphone on (over 8 hours) if I don't use WiFi or watch any videos. I listen to music on and off and read a chapter at lunch. I keep the light setting on low, my cube is bright enough. Note that I have the EDGE phone and not the 3G.
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