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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 the menu icon.
Press Wireless & networks.
Press Mobile networks.
Activate or deactivate
Press Data enabled to activate or deactivate the function.
When the box next to the menu item is ticked (V), data connections are activated.
Press the Home key to return to standby mode.