I have just bought the Samsung Galaxy Apollo i5800 for my daughter. I want her to be able to connect to our home wi-fi network when at home, and any other free ones she can find, but not have the 3G kick in, as her SIM is a very cheap rolling monthly contract with no data plan. We connected to the home wi-fi no problem, but after a while I looked at the phone and saw that it said 3G - she was still at home and surfing happily, thinking she was on wi-fi. Now I'm worried she will be racking up a huge bill without knowing it. How can I turn 3G off?