Managing Data Roaming
How do I avoid data roaming usage and charges, and still stay connected for call and SMS when I am oversea?
You can manage your data roaming usage by switching on or off "Data Roaming" on your phone.
You can do it on your phone, just go Settings, Cellular or Mobile Data to switch on or off your data roaming.
Note: you do not need to have data roaming to use WiFi when you are roaming.