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You can deactivate data connections. Only text messages and calls are then available. This is useful if you want to avoid unintended data traffic. Follow these instructions to activate or deactivate data connections.
Find "Mobile networks"
Press Wireless and network.
Press Mobile networks.
Activate or deactivate data connections
Press Use packet data to activate or deactivate the function.
Press OK, if required.
When the box next to the menu item is ticked (V), the function is turned on.
Press the Home key to return to standby mode.