Check the caller ID or contact name if the number has called or messaged you before
Save the number in your contacts and use messaging apps to see if a profile name appears
Search the number on search engines
Search the number on social media platforms
Use a reverse phone lookup service
Check public business directories
Ask the carrier for help if you have a valid legal reason
Report harassment or fraud to law enforcement or telecom authorities
Use caller ID apps that identify unknown numbers
Contact the person directly and ask who owns the number