How do mobile phones block some unnecessary phone numbers?

You can refer to vivo mobile phone to set the method of rejecting strange calls:

1. Reject strange number: long press this number to add it to the blacklist;

2. Reject all strange numbers:

Funtouch OS 3.2 and above: Enter Settings-(Application and Permission)-(System Application Settings)-Telephone-Block harassing calls/harassment interception, just turn on "Block all incoming calls from strange numbers" (not supported by some models);

Funtouch OS 3.0/3. 1 system: setting to block all strange numbers is not supported;

Funtouch OS 3.0 system: Enter iHousekeeper-Harassment Interception-Settings-Turn on Harassment Interception, then click Interception Mode and select "Accept Contacts Only".