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03 9021 1531 (0390211531): Community reports of silent calls with automated 'Goodbye' message. Victoria local number showing robocall patterns.
Silent Call and Robocall Reports for 03 9021 1531
Two contributors have reported receiving calls from 03 9021 1531 (also written as 0390211531) that follow an unusual pattern: the caller answers the phone, says hello, but receives no response from the other end. After a brief silence, an automated voice cuts in with the word "Goodbye" before the line disconnects. This Victoria-based local number is allocated to Symbio Networks Pty Ltd and has triggered multiple reports of this specific robocall behaviour.
The tactic of connecting a live person only to hand them over to an automated system suggests this number may be part of a callback verification scheme or a probe to identify active phone numbers for future targeting. The abrupt "Goodbye" message is distinctive and indicates a programmed robocall system rather than a traditional telemarketer or scammer.
What Callers from 03 9021 1531 Do
When contributors answer calls from 0390211531, they experience the following sequence: after saying hello, they encounter complete silence on the line. Rather than a person responding, an automated voice immediately delivers a single word-"Goodbye"-and disconnects. One contributor noted they said hello twice during the silence, suggesting the robocall system was already in the process of executing its disconnect routine. Another contributor reported an identical experience where the automated voice cut in after they spoke.
This behaviour is characteristic of robocall testing or validation calls, where systems automatically dial numbers to confirm they are active and being answered by real people. The automated goodbye message suggests the system has completed its primary objective and is terminating the call.
Report Patterns and Timing
Both reports of 03 9021 1531 came within a 24-hour period (18-19 November 2025), with one call answered in the early morning hours. The calls came through as answered calls rather than missed calls, meaning contributors picked up and experienced the silent-then-automated-goodbye sequence firsthand. There is no indication of repeated calls from this number to the same contributor, though the short reporting timeframe makes it difficult to assess frequency patterns.
What to Do If You Receive a Call from 03 9021 1531
If 03 9021 1531 calls you:
- Do: Let unknown calls go to voicemail rather than answering immediately
- Do: Block the number in your phone settings after the first call
- Do: Report it as a nuisance call if it calls repeatedly
- Don't: Try to call back-this may confirm your number is active and lead to more robocalls
- Don't: Engage with the call or provide any information
The silent-call-followed-by-automated-goodbye pattern from 0390211531 is designed to detect active phone numbers. By not answering, you avoid confirming that your number is monitored by a real person.
How to Report 03 9021 1531
If you receive calls from 03 9021 1531, you can report this number through several Australian government channels:
- ACMA (Australian Communications and Media Authority): Report robocalls and nuisance calls at acma.gov.au
- Do Not Call Register: Register your number at donotcall.gov.au to reduce telemarketing calls (though this won't stop robocalls)
- Scamwatch: If the calls escalate to scam attempts, report to scamwatch.gov.au
- Reverseau: Report your experience with 0390211531 to help other Australians identify this number
Contributing your report helps identify patterns in robocall behaviour and may assist authorities in tracking down the source of these automated calls.
Help others by sharing your experience with (03) 9021 1531!
WRITE A REVIEWRatings Distribution
What Our Users Reviewed
Answered call... Said Hello...twice.... No answer.. Then an automated... Goodbye!!
answered, said hello but nothing, then automated voice cut in with GOODBYE
Help others by sharing your experience with (03) 9021 1531!
WRITE A REVIEWFrequently Asked Questions
Why does 03 9021 1531 say 'Goodbye' before hanging up?
The automated 'Goodbye' message from 0390211531 suggests the robocall system has completed its objective-likely confirming your number is active and answered by a real person. The message is a disconnect signal built into the automated system, not a typical human interaction.
Is 0390211531 dangerous if I don't answer?
03 9021 1531 is not immediately dangerous if you don't answer. However, the pattern of silent-call-followed-by-goodbye indicates it may be validating active phone numbers for resale to other robocallers or scammers. Blocking the number prevents further contact.
Should I call back 03 9021 1531?
No. Calling back 0390211531 confirms to the system that your number is monitored by an active person and may result in more calls. It's better to block the number and report it rather than engage.
What does the robocall from 03 9021 1531 want?
Based on the reports, 0390211531 appears to be a number validation robocall. It doesn't seem designed to sell products or collect information-only to confirm your number is active. Once detected, these numbers often move on to the next target.
Can I block 03 9021 1531 permanently?
Yes. Most Australian phone providers allow you to block numbers through your phone settings or your provider's app. Blocking 0390211531 will prevent it from ringing your phone. You can also report it to ACMA for investigation.
Is 03 9021 1531 a real business number?
03 9021 1531 is allocated to Symbio Networks Pty Ltd as a local Victorian service. However, the robocall behaviour suggests it has been compromised, spoofed, or misused for automated validation calls rather than legitimate business communication. The allocation does not guarantee the number is being used legitimately.