Samsung phones have a "Caller ID and Spam Protection" feature that automatically blocks numbers it thinks are spam.
MDTechVideos 1:09 How to remove / unblock a number from the blocked calls list. Handset - unblock a single number or a range of numbers * Press [ CALLBLOCK ]. * Press the arrow up ▲ or down ▼ button to select " Panasonic Block or unblock a phone number - Google Help Unblock a number * Open your Phone app . * Tap More . * Tap Settings. Blocked numbers. * Next to the number you want to unblock, t... Google Help How to Unblock a Number on an Android Phone - Avast Mar 24, 2025 —
iPhones have a feature that silences calls from numbers not in your contacts, sending them straight to voicemail.