Believe to be scam

When reviewing my emergency SOS contact on my Apple IPhone 12 this number was listed. I Never added this number and have no idea how it got there. Deleted it immediately.

I didn't answer, they called at 8pm, no message left

Didn’t leave message. Possibly scam. Always call around 8pm

Caller: unknown

hung up as soon as I answered, likely a scam

Also believe to be a scam

Caller: Don't care.

Interstate number - in my book, that is likely to be a scammer.

This number is in the same range as another nuisance caller - (02) 9184 9722.
Many of these types of calls are only to establish if the number being called is real - and if someone answers - to then be used in the future for telemarketing / polling etc. Thus many people will report these numbers as being ' no caller / no message left'.