Dial `*67` before the phone number you want to call
Use your phone’s call settings to hide caller ID
On iPhone, go to `Settings` > `Phone` > `Show My Caller ID` and turn it off
On Android, open the Phone app, go to `Settings` > `Calls` or `Calling accounts` > `Additional settings` > `Caller ID`, then choose `Hide number`
Contact your carrier to block your number for all outgoing calls
Use a temporary or secondary phone number if caller ID blocking is not available