- Legit
- Uncertain
- Suspicious
Community reports for 03 8357 8400 (0383578400): Mix of legitimate contact, silent calls, and missed calls. Optus mobile number in Victoria.
Silent Call and Uncertain Activity Reports for 03 8357 8400
Three contributors have reported activity from 03 8357 8400 (also written as 0383578400), with a notably mixed pattern. One contributor confirmed this as a legitimate contact after receiving an accompanying email. However, two other reports flag concerning behaviour including silent calls and rapid hang-ups, suggesting this Optus mobile number in Victoria may be generating calls from multiple sources or using inconsistent dialling practices.
The most troubling report involves repeated silent calling from 0383578400. A contributor received two missed calls within two days, with the caller disconnecting so quickly that the phone never even registered an incoming call notification. This type of rapid hang-up pattern is commonly associated with automated systems testing line validity or callback scams.
What Callers from 03 8357 8400 Are Doing
The behaviour reported from 03 8357 8400 varies significantly across the three reports. One contributor initiated contact or received legitimate communication, later confirmed by email correspondence. This suggests the number may be associated with a real business or service.
The silent call pattern is distinctly different. The contributor experiencing repeated calls from 0383578400 described immediate disconnections before the phone could even register an incoming notification. This suggests either an automated callback verification system or a scammer testing whether the number is active and monitored by a real person.
A second report involved a single missed call from 03 8357 8400 where the contributor was simply uncertain about the source. They searched for the number to identify the caller and have indicated they will monitor for further contact.
Call Patterns and Timing
Two of the three reports about 03 8357 8400 occurred on the same day (12 March 2026), with one contributor receiving the call unexpectedly and another tracking down the number through search. The silent call reports are older (22 February 2026) but show a concentrated pattern of two calls within a 48-hour window.
The rapid disconnect behaviour reported from 0383578400 is time-efficient from the caller's perspective, suggesting automated rather than manual dialling. Contributors did not report any audio connection, voicemail messages, or verbal interaction.
What to Do If You Receive a Call from 03 8357 8400
If 03 8357 8400 calls you:
- Do: Let unknown calls go to voicemail and listen for a message. If they disconnect immediately, note the pattern and block the number.
- Do: Check your email for any legitimate correspondence. If you were expecting contact from a business, verify the sender's address against their official website.
- Do: Block the number in your phone settings if you receive repeated calls from 0383578400 without leaving a message.
- Do: Be cautious if calls resume after blocking, as this may indicate a callback scam testing different approaches.
- Do not: Call back unknown numbers that hang up immediately. Callback scams may involve premium-rate lines or data harvesting.
- Do not: Share personal information if you do answer and the caller hasn't identified themselves.
How to Report 03 8357 8400
If you receive unwanted calls from 03 8357 8400 or 0383578400, you can report the activity:
- ACMA (Australian Communications and Media Authority): Report silent calls and callback scams at acma.gov.au. They investigate patterns of calls designed to trick people into returning them.
- Scamwatch: If you suspect a scam attempt, report details at scamwatch.gov.au with information about timing, caller claims, and your interaction.
- Do Not Call Register: If this is telemarketing, register your number at donotcall.gov.au to reduce unsolicited calls.
- Reverseau: Contribute your experience with 03 8357 8400 to help other Australians identify unknown callers. Your report adds to the community intelligence about this number.
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WRITE A REVIEWRatings Distribution
What Our Users Reviewed
Originally didn't recognise number, but since had an email, and it is a legitimate place.
Unsure who call is. Wasn't expecting. Didn't ring long, hung up before I could. Searched number to get a guide to who it was, and ended up here. Will monitor to see who it is.
Called twice in two days, two missed calls, they ring and hang up so quick my phone didn’t even make incoming call ring.
Dodgy.
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WRITE A REVIEWFrequently Asked Questions
Is 03 8357 8400 a legitimate business number?
Possibly. One contributor confirmed 03 8357 8400 (0383578400) as legitimate after receiving an accompanying email. However, other reports describe silent calls and rapid disconnections. If you were expecting contact from a business, check your email and verify the sender against their official website. If you weren't expecting the call, the silent call pattern from 0383578400 is a warning sign.
Why would 03 8357 8400 call and hang up immediately?
Rapid disconnections from 0383578400 are commonly used by callback scams to verify if a number is active and monitored by a real person. If you don't answer, they may call back pretending to be from a bank, utility, or government agency, pressuring you to return a missed call to a premium-rate line. One contributor reported two such calls from 03 8357 8400 within 48 hours.
What should I do if I keep getting silent calls from 03 8357 8400?
Block the number immediately in your phone settings. If calls continue after blocking, report the pattern to ACMA at acma.gov.au, as repeated silent calls from 0383578400 may indicate a systematic callback scam operation. Do not attempt to call the number back, as this confirms your number is active and may escalate the targeting.
Could 03 8357 8400 be a scam using a real Optus number?
Yes. Scammers can spoof phone numbers or compromise legitimate lines. The fact that 0383578400 is registered to Optus in Victoria does not guarantee legitimacy, especially given the silent call reports. One contributor experienced two calls in two days from 03 8357 8400 that disconnected before voicemail could engage, a classic callback scam signature. Always verify contact independently through official channels.
How do I verify if 03 8357 8400 is genuinely trying to contact me?
If you suspect 0383578400 may be legitimate, check your email for recent contact from the sender. Look up the business or organisation's official phone number (from their website, not by returning the call) and ask them directly if they tried to reach you. Never use a phone number from a voicemail or text message to verify. This method protects you from callback scams even if 03 8357 8400 sounds official.
Should I report my experience with 03 8357 8400 to Reverseau?
Yes. If you receive calls from 03 8357 8400 or 0383578400, report your experience on Reverseau to help other Australians understand the pattern of activity from this number. Community reports are essential for identifying whether this is a legitimate business number, a compromised line, or a scammer using spoofing tactics. Your contribution helps build accurate caller intelligence.