Hi there @Jodibabe74. Are you referring to deleting your call history from your handset?
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Calls to 000 are not listed on your bill etc.
On my Android phone I just long press a call record and the option to delete it pops up.
As others have mentioned the fact you made the calls will be recorded (as well as you number) at both Optus and the Police station for legal reasons. They won't divulge them but you can't remove the record.