Block unknown callers with call screening service.
By default block phone numbers that are not saved in your contacts list.
Optionally:
- allow numbers that you have called
- allow numbers with toll-free codes (ex: 800)
- allow a third call from the same number within five minutes (cache constraint)
- allow temporary mobile numbers from incoming text messages
- allow numbers that passed STIR verification (android 11)
If app rejects calls from contacts on android 10, allow contacts permission manually in
app info > permissions.