How can I keep my batery longer?

How can I keep my battery longer?

None of the suggestions thus far have a significant affect on battery life.
Screen brightness on Automatic is the best setting, as it provides only as much brightness as you need.
WiFi uses ZERO power when the phone is on Standby, and minimal power when the phone is active. But if you are within range of a WiFi hotspot WiFi will use less power than Cellular data. So unless you have the phone actively being used for hours at a time the WiFi setting will make no difference.
3G off will save some power in light use because GPRS uses less power but is MUCH slower. So if you are transferring a lot of data turning 3G off will actually use more power, since transfers will take 3-4 times as long and the difference in power consumption between 3G and GPRS is only 2 times.
Bluetooth uses no significant power unless you are actively using a Bluetooth device, and then you would clearly want it on. BT runs at 3 milliwatts, hardly enough to matter.
If you did all of the suggested things you might get an extra few minutes a day.
If your phone is using a lot of power there are only 2 possible causes - Interactive games, and large data transfers. Nothing else on the phone comes close these two uses. FIRST you should determine if your power use is within spec for your paticular usage pattern. It probably is, but you can work it out for yourself by comparing your usage to the specs for the phone: http://www.apple.com/iphone/specs.html

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