1. If you use a vivo phone, go to I Housekeeper-Practical-Harassment Interception-Telephone Interception and turn on overseas call interception. Note: At present, only the OriginOS system supports this function.

2. Turn on the phone and click the Settings button in the upper right corner. Select harassment interception in the call settings, and click Enter. Select call interception in harassment interception, and click Enter. Just turn on the option of intercepting overseas calls in call interception.

3. Turn on the phone, enter the settings and select "Do not disturb mode". Open "do not disturb mode" in the next section and click "Allow the following calls". Select "All Contacts", that is, under do not disturb mode, all strangers are blocked except the contacts in the address book who can get through to you.

4. Click the phone in the Apple phone to enter the settings page, and then click the phone function. Click Call Blocking and Identification on the phone settings page, and then click Call Blocking and Identification. Find the caller ID application. On the page of call interception and identification, find the caller ID on your mobile phone.