How to block spam calls on iPhone
To stop spam calls on your iPhone, you need to install a service like Truecaller. Once installed and configured, go to settings > phone > call blocking and identification > toggle all four options. Now, open the Truecaller app and enable spam detection. While this won’t automatically block spam calls, the Truecaller will compare the phone number with the database if it is a spam call.
How to block spam calls on Android
If you have an Android phone with Google dialer, then open the app > click on the three dots in the top right corner > settings > caller ID and spam > and enable filter spam calls, which will automatically block suspected calls on your Android smartphone.