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How does Apple stop strangers from calling and texting?

Take Apple 7plus as an example.

The method is as follows

1. First, open the settings of the mobile phone, as shown in the following figure:

2. After entering the interface, open the do not disturb mode interface, as shown in the following figure:

3. Open the slider behind the Do Not Disturb mode option, as shown in the following figure:

4. Open the "Allow the following calls" column.

5. Finally, click "All Contacts", as shown in the following figure: