Can my child use the phone without a phone plan, and just use WiFi?

Yes. However, MMGuardian requires an internet connection (WiFi if not mobile data) for your commands to be sent to the child phone and for phone usage and location updates to be reported.

Purely on-device parental control functions such as Time Limits and App Control will function even if there is no internet connection.

Please note that Call Reports, Contact Block and SMS text message reporting will not work with ‘over the top’ apps such as TextFree.