This appears to be a scam; no message was left. When I called back, the recording said, "Optus advises the mobile number you have called has been disconnected."
Scam Alert: No Message Left - +61 3 9017 9436 ((03) 9017 9436)
概览 — +61390179436
专家点评
Ever received a silent call that raises red flags? This number, +61390179436, appears to be involved in scam activity, with no message left and the line reportedly disconnected upon callback. Such tactics are common for scammers testing active numbers or preparing phishing attempts. Block it immediately to avoid risks, and report to authorities like the ACCC in Australia. Enable caller ID on your phone, and never return calls to suspicious numbers—use official channels instead. If you've engaged, monitor accounts for unusual activity and consider a credit freeze for added protection.
