Do you have a data plan high enough to cover your usage, or are you worried about being billed for excess?
iPhone is a data hungry device. Google Maps pulls the graphics via data, it updates all the widgets (stocks, weather, etc.) pings mail servers, and 3rd part apps typically connect at times as well.
If you have 1GB+, I wouldn't worry about it too much. If you've got 250MB or less, then we can try and figure out ways to help you out...
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