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PIRELLI
One of the main feature (or annoying complaint) about Android-based mobile phone or smartphone such as Motorola Droid , Motorola Milestone, HTC Hero , HTC Magic, HTC Desire, HTC Legend, Google Nexus One and etc, is that there are some apps or processes that consistently want to access, or download and upload data through Internet, especially for auto-sync and status update. When Wi-Fi or wireless connection is not available, the phone will automatically dial and connect to Internet via mobile data connection, such as 2G (GSM/CSD), GPRS (2.5G), EDGE/EGPRS (2.75G), 3G, and HSDPA/HSPA+ (3.5G). The main problem with mobile data connection is that most data plan from mobile carrier is not unlimited. In other word, the data plan of most mobile voice and/or data plan package often only include limited amount of free data bandwidth (or even no free data bundled or included on pure voice call plan).
How to Turn Off and Disable Mobile Data Connection (2G/GPRS/Edge/3G) on Android Phone » My Digital Life