Late afternoons in Sydney often see a spike in unsolicited calls like this one from an Australian mobile number. The pattern—immediate hang-up on answer followed by a vague voicemail—points to automated dialing systems testing active lines, common in nuisance campaigns. Telecom logs show these tactics evade direct complaints while probing for engagement. Block the number immediately on your device or via your carrier's app to stop repeats. If it persists, report to the Do Not Call Register for potential tracing. Stay cautious with unknowns; never share personal info without verification.
Call disconnected immediately after I answered; the callback voicemail was vague – probably a nuisance.