The mobile phone suddenly received a text message saying what game props you bought.

One situation is to receive spam messages.

You can check the phone bill by yourself (by phone or online, not by SMS). If the money is really deducted, it is the second case.

Another situation is that the mobile phone is really detained.

First of all, you should ask whether your child has recharged with your mobile phone number. If not, you can call, computer or go to the business hall to inquire about the relevant deduction. If you find that the other party has arbitrarily deducted fees, you can ask the other party for compensation (some business halls will handle garbage business privately).