I often receive advertising text messages from strangers. I want to know how these people obtained my number?

The first type is leaked through some websites where you have entered personal information, as well as express delivery orders. Sometimes unscrupulous operators will also leak customers' personal information.

The second is that they did not obtain your number at all, but just used the SMS group sending function of a certain number range. Unfortunately, your number is in that number range.

If the advertising content is related to your online information, it is usually the first type, otherwise it is the second type.