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at&t data packet and background data

whats the difference between turning off the data packet and turning off the background data.....i keep my data packet off to prevent sending and receiving data when im not using it to help improve my battery life.....i thought turning this off would prevent my apps and widgets from syncing and receiving data??....then what is turning off the "background data" as the description for it in my settings says, to prevent applications can sync ,send , and receive data at any time? i thought that's what turning off the data packet was suppose to do? if i turn off data packet but keep background data checked will my apps, widgets still sync?
 
whats the difference between turning off the data packet and turning off the background data.....i keep my data packet off to prevent sending and receiving data when im not using it to help improve my battery life.....i thought turning this off would prevent my apps andbackgrounf widgets from syncing and receiving data??....then what is turning off the "background data" as the description for it in my settings says, to prevent applications can sync ,send , and receive data at any time? i thought that's what turning off the data packet was suppose to do? if i turn off data packet but keep background data checked will my apps, widgets still sync?


From my understanding, which could very well be wrong, keeping background data enabled but data packet off will still allow things to update like weather, location stuff like that as long as you have another data source like wifi. I know the market will not work with background data turned off. When i have wifi and mobile data off but background data on I can check my usage and see no data being used during this time. When you turn background data off it prevents auto syncing. If you uncheck background data you will notice the auto sync option kind of grays out. So with this off the only way to sync info for email, weather and whatnot is to open those apps and manually do it.

So data packet is you mobile data connection

Background data allows apps to auto sync info while an app isn't actively open
 
In my test:

Google Talk won't work if Background Data is turned off.
Google Voice won't work if Packet Data is turned off.

So, on my phone at least, neither can be unchecked.
 
I have samsung infuse... Im not seeing a background data anywhere in my settings... Does that mean both are combined in my data packet check box??
 
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