Inexplicably received the verification code of Wutai Mountain Visitor Center.

1. Before executing app to receive the verification code, the verification code came late due to busy network or bad signal.

2. A way to advertise on the app website. For example, an application writes the name of the app in the text of the verification code, which is particularly easy to attract people's attention. Let it pick up the phone and have a look, so as to achieve the advertising effect.

Someone made a mistake. When registering or registering on some software, you need to fill in the mobile phone number and accept the verification code. It may be because of an input error, the wrong phone number was entered, and the wrong phone number happened to be your own number, so the verification code was sent to yourself.

4. the 4.app number was stolen. For example, after the account is stolen, others will change the bound mobile phone number. Generally, such an operation will send a verification code to the old mobile phone number.

5. Suspected of fraud. For example, fraud criminals pretend to be banks and other financial institutions, and take the verification code as the first step to open fraud crimes.