Dial *67 before the phone number you want to call
Use your phone’s call settings to hide caller ID for all outgoing calls
On iPhone, go to Settings > Phone > Show My Caller ID and turn it off
On Android, open the Phone app settings and disable Caller ID or Caller ID display
Contact your mobile carrier to block caller ID on your line
Use a VoIP app or service that supports caller ID blocking
Check local laws and carrier rules before blocking your caller ID