My co-workers daughter is off to Japan at the end of the month for 4 weeks as an exchange student. She is 13 years old. Her mother was going to get her a mobile phone and put international roaming, but I advised her against it as I said that daughter will have to pay for any incoming calls, SMS's etc. I suggested that the best option would be a phone card from Telstra which bills calls to the landline...or does anyone have any other suggestions?