When you set up the box it will initially ask you set up a password for the network. This is not the password you need to use for setting up Mobile Zone on your child's phone, instead you will need to use your account password which will then take you to a page asking you to assign the device. The network password is only needed when you are trying to connect to your network via WiFi.
If you are having any more issues please call our support staff on 1300 398 326 and they can help set thing up with you.
Customer Service Representative