Use a caller ID blocking code before dialing, if available in your country
Check your phone settings and disable caller ID for outgoing calls
Use a prepaid phone or SIM purchased without linking to your personal information, where legal
Use a VoIP or calling app that lets you hide or change caller ID, if permitted
Call from a public phone or another phone not associated with you
Contact your carrier and ask about permanent caller ID blocking options
Use a business line or secondary number instead of your personal number
Verify local laws and carrier rules before making anonymous calls