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Old November 8th, 2009, 06:14 AM   #2 (permalink)
informale
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I suppose "background data" is a feature that lets an application use data when it's running in background. For example GMail, Calendar and Contacts are being synced in background and need "background data" = on, weather apps and gadgets need background data to update forecast, Latitude needs background data to update your location, etc. If you turn background data off, applications can only access internet on your demand (that's my assumption, may be they will simply refuse to work at all). For example, Browser is a classic example of application which uses data on demand.
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