Why is the screen always on after Apple receives a text message?

Because the function of never locking the screen is turned on, it will always be on.

The closing operation steps are as follows:

1. Click the main screen to enter the setup application.

2. Click to enter the general options.

3. Drop down to find the automatic locking option to enter.

4. Select the time for automatic locking. When the phone is not working, the screen will be locked when the time is up.