Contact your phone carrier and ask about available caller ID tracing services
Use your carrier’s call log and blocking tools
Enable call tracing features if your carrier offers them
Save the date, time, and duration of each no caller ID call
Report threatening or harassing calls to local law enforcement
Ask law enforcement to request carrier records if needed
Use a call-blocking or spam-filtering app that logs unknown calls
Set your phone to silence or send unknown callers to voicemail
Request a trap and trace service from your carrier if available
Do not answer repeated suspicious calls
Keep records of voicemails, texts, and call patterns
Contact your carrier immediately after receiving threatening calls