Thanks for your post and welcome to the Community Forums, Madscot,
Sorry to hear that your son has not been able to use his data. We would not have turned it off unless billing related. We'd be happy to check his service if you like, but if he has available mobile data allowance then it should be working.
@jb66 is correct that congestion can be a possibility when large groups gather.
Cheers,
Corey C