Enable your phone’s built-in call blocking or silence unknown callers feature
Contact your carrier and ask for anonymous call blocking or call filtering options
Use a spam-blocking or call-filtering app
Register your number on the National Do Not Call Registry
Do not answer calls from No Caller ID numbers
Let unknown calls go to voicemail
Block or report repeated harassing calls through your carrier
Ask your carrier for a new number if the calls continue
Turn on Do Not Disturb and allow calls only from saved contacts
Check your phone settings for blocked, hidden, or unknown caller options