Is there a charge for sending text messages to mobile phones with QQ?

There is a loophole in QQ where you can send short messages for free. Once this loophole was announced by netizens, it caused an uproar! If you don't know, here is a brief introduction. This loophole is like this: Under normal circumstances, you can apply to bind your QQ number to your mobile phone, so that you can send short messages through QQ, and the fee will be deducted from your mobile phone fee. However, if your mobile phone is shut down due to arrears, resulting in the cancellation of your mobile phone number (of course, you can also take the initiative to cancel your mobile phone number), because Tencent's data is not synchronized with the data of the telecommunications department, resulting in QQ being stupid and not knowing that your mobile phone is cancelled, you can still use the previously bound QQ to send text messages to other mobile phones, but the cost is not yours. So as long as someone binds the mobile phone to the QQ number and then cancels the mobile phone number, they can send mobile phone messages with the QQ number for free! And the sending speed is extremely fast!