Use a call-return or callback code if your carrier supports it
Check your phone’s recent call log for any partial caller details
Contact your mobile carrier and ask about anonymous call tracing options
Enable call tracing features provided by your carrier
Use a third-party call-blocking or call-tracing app with caller ID lookup features
Report repeated harassing calls to your carrier and request assistance
File a complaint with law enforcement if the calls are threatening or abusive
Ask the caller to reveal their number if you answer the call
Review voicemail greetings or messages for clues about the caller
Use call screening settings to identify unknown callers before answering