1 - JuiceDefender
This is certainly the best known, but also the most effective. The free version is quite complete and very easy to use.
App will manage connections 2G, 3G and WiFi, in order to optimize their use for each application. It also allows you to control the brightness of the screen,
so often better suited than does your device automatically. Nice little option: you can specify the peak and off as sleep time, weekends
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