Deliberately missed this call and there was no message left. Checked here and found nothing so called it back but I got "network busy" which it wasn't. So assumed it's a nuisance call of some description. Blocked now.

Just rng twice then nothing..

i guess i’m not the only one. just be careful our phones can get hacked just by accepting the call. be smart. lucky i didnt pick it up. technology these days is getting more dangerous for people use it in a bad way.

called back seconds after I missed the call for Optus to say it's disconnected... dodgy AF.

I called back a missed call within one minute, Optus message saying number had been disconnected. Assume it's spam

Caller: Wtf wld know

The usual - no message left. The same sh*t I get many times a day.
I have a private unlisted number for a reason.
Time to get this sh*t sorted- unethical & Illegal when private.

I called back and same message says person is not available. Don't trust

I received multiple calls and they leave a message, however there is nothing on the message.

I called back number 0436 474 136 reached voice mail but did not say for what company.