UK Three Mobile customer here. I got my 12yr old son a dumb phone for phone calls, emails and texts only. Set him up with a SIM only plan with me as the account holder. Now he wants to know how to check his data balance — obviously he can’t use the Three App, and has no access to websites. So how does he check his data balance? Is there an SMS option to do this? I can’t seem to find one in the online help documents.
