Why can't I call in when I set a strange text message on my Apple phone?

I believe that for the majority of mobile phone users, the most annoying thing is to receive strange text messages and strange phone calls. At this time, I definitely want to completely stop these rubbish from invading our mobile phones again and again. Here are the specific operation steps for everyone:

1. Click the settings icon on the main screen of iPhone to enter the settings, scroll down to find "do not disturb mode", and click Open directly.

2. At this time, the system defaults to the closed state of "do not disturb mode". Slide the right button to open Do Not Disturb mode.

3. When the Do Not Disturb mode is turned on, click the "Allow the following calls" option below.

4. At this point, if you want to stop all strange contacts, just click to select all contacts.

5. When this setting is turned on, the incoming call list will only show when there is a strange incoming call, and you will not be prompted.

6. It is also applicable to unfamiliar SMS, which can be viewed in the SMS interface. If you want to completely block this number, just click "Details" in the upper right corner.

7. In the page that opens, click "More" to the right of the strange number.

8. Select "Block this calling number" at the bottom of the page.

9. A reminder menu option "You won't receive calls, messages or Facetime from blacklisted contacts" will pop up at the bottom of the page. If you are sure you want to permanently block this strange number, click Block Contacts.