The mobile phone automatically sends my mobile phone serial number and model to an unknown number.

I have never encountered this problem before, but if you are charged excessively, you should contact us and file a complaint! However, your problem can be solved by communicating with them. You can ask the staff to help you check if there is any problem with your card, or ask them to block those numbers so that you will not send text messages there. Know that these are usually forged mobile phone serial numbers and have no effect on you, just like forging license plates!