What if personal information is leaked? There are always various sales calls, and I don't want to change my mobile phone number.

First of all, you should find out where your information was leaked. Many of my friends do the same. Some people left the mobile phone number of Shangqiao on the search engine, and some people left their mobile phone numbers on some new media platforms such as BBS /SNS/ Weibo. I think this kind of situation is usually done by someone you know. Find out the root of the problem first, and then follow the root of the problem to solve the problem. If someone calls you now, you can ask him where he saw your mobile phone number first, and then follow this clue. I hope you can solve this problem!