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You can deactivate data connections when roaming. Only text messages and calls are then available. This is useful if you want to avoid unintended data traffic when roaming. Follow these instructions to turn data roaming on or off.
Find "Mobile networks"
Press All apps.
Press Wireless & networks.
Press Mobile networks.
Turn data roaming on or off
Press Data roaming to turn data roaming on or off.
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.