Use the phone’s built-in caller ID or call log to identify the number
Search the number in a reverse phone lookup service
Check the number on search engines and social media
Save the number and see if messaging apps show a profile name or photo
Contact your mobile carrier for help with unwanted or suspicious calls
Report harassing or threatening calls to law enforcement
Use a spam-blocking app to identify likely caller information
Ask the caller directly to identify themselves
If the number is linked to a business, check the business website or directory
If it is an emergency or safety issue, contact local authorities immediately