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Help Power control widget

What is "sync"?...is that the same as the 3g data option everyone recommends turning off for battery life? Yes, I know what the word "sync" means but I don't get what it does in this context.

"Sync" it the device checking your facebook, email, twitter, etc.

3G Data off/on is the "Mobile Network" button, not on the "power widget" but it has its own widget.

From my experience turning off sync you can still use mobile data (web, facebook, etc) but it won't automatically search for any status updates/ emails. This does conserve the battery as it isn't using battery to search and is only using battery when you physically do something.
 
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