Others know my mobile phone number. Is there any way to let others know that I have contacted others?

I don't think it's possible. As the 3rd floor said, know your number, successfully copy the sim card, and know your communication record at most. I'm from Meizhou Mobile, Guangdong. When I need to know my communication records, I take my mobile phone to the mobile service hall and input my service password into the machine. When I need to query the communication records, I also need to input the random number sent to you by the system for verification. In addition, we know that the short messages sent to you by others are generally stored in the mobile phone, and the storage medium is the memory of the mobile phone or the memory card (which has nothing to do with the sim card), so it is impossible for him to steal your short messages. What if the information is stored in the sim card? I don't think so. Unfortunately, I lost two sim cards, and every time I reissue them, the information on the sim card is gone, so the information on the sim card is stored on the sim card. The card is gone, and the information is gone. Therefore, no matter whether your information is stored on a sim card or a mobile phone, no one else can steal your information by copying your SIM card. Don't worry too much, your communication security is relatively guaranteed, and our communication operators are not freeloaders. They will also try to protect your communication privacy, otherwise no one will use his card. You should also have a sense of security, keep the service password as complicated as possible. If you accidentally lose your mobile phone, you should report it as soon as possible. Well, that's about it. It's okay. Don't worry too much. There are always alarmists around us.