Dial *67 before the number you want to call
Use your phone’s caller ID settings to hide your number for all outgoing calls
On iPhone, go to Settings > Phone > Show My Caller ID, then turn it off
On Android, open the Phone app > Settings > Calling accounts or Supplementary services > Caller ID, then choose Hide number
Contact your carrier to request permanent caller ID blocking
Use a secondary or temporary phone number app if needed
Check local laws and carrier rules before blocking your number