- Suspicious
04 4013 3123 (0440133123) flagged by 2 contributors as unknown caller with no voicemail. Mobile number on Optus network.
Unknown Caller Reports for 04 4013 3123
Two contributors have reported receiving calls from 04 4013 3123 (also written as 0440133123) without any voicemail message left behind. Both instances involved missed calls from an unidentified number, with no explanation or callback information provided by the caller. The number is registered as an Optus mobile service.
The pattern across these reports suggests the caller either disconnected before leaving a message or deliberately avoided identification. Neither contributor recognised the number, and the lack of voicemail provides no context for why 0440133123 contacted them.
Call Patterns
Both reports of 04 4013 3123 came through as missed calls. One was received on 24 November 2025, and another on 13 November 2025. The absence of voicemail in both cases is notable, as legitimate callers typically leave some message or indication of purpose when reaching an answering machine or voicemail service.
What to Do If You Receive a Call from 04 4013 3123
If 04 4013 3123 calls you:
- Do: Let unknown calls go to voicemail and listen for a message explaining the purpose of the call
- Do: Check if the number appears in your contacts or recent call history before returning any call
- Do: Block the number if calls from 04 4013 3123 continue without voicemail messages
- Do not: Return the call immediately, especially if you don't recognise 0440133123
- Do not: Share personal information if you do decide to call back
If you're concerned about repeated calls from this number, you can block it on your phone or through your Optus account settings.
How to Report 04 4013 3123
If you receive additional calls from 04 4013 3123 and believe the behaviour is harassing or suspicious, you can report it to:
- ACMA (Australian Communications and Media Authority): acma.gov.au - for complaints about unwanted calls
- Do Not Call Register: donotcall.gov.au - if the calls are unwanted telemarketing
- Reverseau: You can also contribute your own experience with 0440133123 to help other Australians identify unknown callers
Help others by sharing your experience with 0440 133 123!
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What Our Users Reviewed
Called but didn't leave voicemail
Got a call, didn't know who it was, no voicemail left
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WRITE A REVIEWFrequently Asked Questions
Why would someone call and not leave a voicemail?
Several reasons are possible: they may have reached the wrong number by mistake, the call was disconnected before they could leave a message, or they were testing whether the number was active. The two reports of 04 4013 3123 both show this pattern. Some callers intentionally avoid leaving messages if they're conducting unsolicited surveys or checking contact lists.
Should I call back 04 4013 3123?
Unless you recognise the number or have a pending callback from this contact, it's safer not to return calls to unknown numbers like 0440133123. If it's genuinely important, the caller will typically leave a voicemail explaining the purpose. If they don't, that's a good indicator they weren't trying to reach you specifically.
Is 04 4013 3123 a scam number?
The two reports of 04 4013 3123 don't indicate scam activity - they're flagged as uncertain and suspicious due to the lack of contact. However, the absence of voicemail is unusual. Scammers often use this tactic to test numbers before targeted campaigns. If you receive repeated calls from 0440133123, blocking it is a reasonable precaution.
Can I block 04 4013 3123 on my phone?
Yes. On most Australian phones, you can block 0440133123 directly from your call log by selecting the number and choosing 'Block' or 'Add to Blocked List'. If you have an Optus account, you can also manage call blocking through the My Optus app or contact Optus support for additional filtering options.
What if 04 4013 3123 keeps calling me?
If 0440133123 continues calling without leaving voicemail, you have several options: block the number on your phone, report it to the Do Not Call Register (donotcall.gov.au) if it's unwanted telemarketing, or lodge a complaint with ACMA if the calls feel harassing. You can also contribute a report on Reverseau to help other Australians identify the number.
How can I find out who is calling from 04 4013 3123?
Without a voicemail message, identifying the caller behind 0440133123 is difficult. You could try a reverse phone lookup service like Reverseau to see if other contributors have identified the number, ask friends if they recognise it, or wait for a text message that might clarify who's trying to reach you. Legitimate callers will eventually leave a message or follow up with an email or text.