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How to turn on and off 3G?

I find it useful to have on my home screen a "Settings shortcut" widget linked to the "Data usage" settings screen.

You don't need to go to the Play Store for this. It is one of the built-in widgets.

The Data usage screen has a slider at the top to turn Mobile data on and off. There is also useful information about how much data each app has used and you can set a limit to prevent the phone going over your Mobile data usage allowance.
 
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