Kurt "Cyberguy" Knutsson outlines the simple steps to block unknown calls on your Android and iPhone so you can avoid those spam calls.

How to block No Caller ID calls on your Android Phone For those wishing to block incoming calls that present as ‘ No Caller ID ‘ or ‘ Withheld Number ‘ on your Android device, the ...

How to block your phone number for every call If you don't want anyone to see your phone number when making calls, you can follow these directions. Step 1: On your Android phone, select the Phone app.

There are multiple ways to block your phone number when calling someone.

Whether you have iOS or Android, use any of the above methods to ID hidden phone numbers and block them. Or block unknown numbers altogether.