Why do mobile phones always deduct money when they don't send text messages?

Please tell me the brand of your mobile phone. I judge that if it is a smart phone, it may be infected with a virus. If it is not a smart phone or the mobile phone is equipped with rogue software, Monternet can be turned off, or the number of the SMS center can be deleted, and the service setting can be changed to blank, so that the mobile phone can not send text messages and receive letters. If you don't send text messages or receive letters, you can send them yourself instead.