Find "Wireless & networks"
Press the menu icon.
Press Settings.
Press Wireless & networks.
Activate or deactivate data connections
Press Mobile network to activate or deactivate data connections.
When the box next to the menu item is ticked (V), the function is turned on.
If you activate data connections:
Press Connect to confirm.
Press Connect to confirm.
Exit
Press the Home key to return to standby mode.