How to Silence unknown Callers in iPhone?

1. Go to Settings.

2. Go to Phone.

3. Enable Silence Unknown Callers.

Free Online Notes taking tool

Free or Best Online Notes taking tool.

Try http://keep.google.com/

You can download the app in your mobile

https://apps.apple.com/us/app/google-keep-notes-and-lists/id1029207872

https://play.google.com/store/apps/details?id=com.google.android.keep&hl=en_US