03 9917 9443 - 0399179443: Silent Call and Nuisance Reports

• Suspicious
• Legit
• Spam
• Unknown
• Scam

03 9917 9443 (0399179443) receives 7 community reports for silent calls and nuisance activity. Callers hang up immediately or leave dead air when answered.

Silent Call Reports for 03 9917 9443

Seven contributors have reported calls from 03 9917 9443 (also written as 0399179443) with a clear pattern of silent or hang-up behaviour. Three separate reports document callers who answer but immediately hang up or leave dead air on the line. This number, allocated to Symbio Networks in Victoria, shows a consistent pattern of non-productive calling activity that suggests automated systems rather than genuine business contact.

The behaviour associated with 0399179443 is characteristic of callback verification scams or robocall testing, where automated systems dial numbers to confirm they are active, building lists for later scam targeting. One contributor received five calls in quick succession with no voicemail left, ultimately blocking 03 9917 9443 as spam.

What Contributors Experienced from 03 9917 9443

When contributors answered calls from 03 9917 9443, the experience was consistently evasive. One contributor reported answering and hearing only silence before the caller disconnected. Another picked up to find no one on the line, followed by immediate hang-up. A third contributor answered to dead air before the line went silent and disconnected.

The non-answered calls from 0399179443 also show a pattern of persistence. One contributor received calls on two separate dates (24 July and 30 September) with no voicemail left either time. Another was called five times consecutively without any message, prompting them to block the number entirely. A single report mentioned the caller was attempting to promote Coles Myers Giftcards, suggesting at least one instance of telemarketing intent, though this is inconsistent with the broader silent-call pattern.

Call Patterns and Timing

Reports about 03 9917 9443 span from November 2023 to March 2026, indicating this number has been active for an extended period. The most recent activity cluster occurred in late 2025, with three silent-call reports between October and November. The earlier November 2023 report mentioning Coles Myers Giftcards suggests the number may have been used for different calling campaigns over time, or may be shared among multiple calling operations.

The immediate hang-up pattern reported by multiple contributors suggests the calling system is designed to minimise human interaction. Contributors who let calls go to voicemail received no messages from 0399179443, which is consistent with automated systems testing numbers rather than attempting genuine communication.

What to Do If You Receive a Call from 03 9917 9443

If 03 9917 9443 calls you:

• Do not: Engage with the call, press any buttons, or return the call if you don't recognise the number
• Do: Let it go to voicemail, block the number immediately, and note the call date if patterns emerge
• Do not: Answer if you're uncertain, as this confirms your number is active to automated systems
• Do: If you do answer and hear silence, hang up immediately - do not stay on the line or press keys
• Be aware: Silent calls are often used by scammers to verify phone numbers for later scam campaigns, so blocking 0399179443 helps protect you from follow-up fraud attempts

How to Report 03 9917 9443

If you've received calls from 03 9917 9443 or 0399179443, report the activity to Australian authorities:

• ACMA (Australian Communications and Media Authority): Report nuisance calls and silent calls at acma.gov.au. ACMA tracks patterns across numbers and can take enforcement action against persistent offenders.
• Do Not Call Register: Register your number at donotcall.gov.au if you haven't already. While this won't stop scammers, it provides evidence of your preference not to receive marketing calls.
• Scamwatch: If you believe 03 9917 9443 is part of a scam campaign, report it at scamwatch.gov.au with details of the call date, time, and what happened.
• Reverseau: Share your experience with 0399179443 on this site to help other Australians identify and block the same number.
• Your phone provider: Contact Symbio Networks or your service provider if you recognise the allocated provider, though most carriers now allow direct blocking and reporting through their apps.

Understanding Callback Verification and Silent Calls

Silent calls from numbers like 03 9917 9443 often serve as the first stage in a multi-stage scam process. Scammers use automated systems to dial large batches of numbers, and when a call connects (either answered or detected as valid), they flag that number for follow-up contact. By confirming your number is active and monitored, you may become a target for follow-up scam attempts from different numbers.

The persistent calling pattern reported for 0399179443, where some contributors received multiple calls over weeks or months, is consistent with this verification behaviour. Blocking 03 9917 9443 stops the immediate nuisance, but also helps protect you from being re-targeted by related scam operations that rely on these verified number lists.

Frequently Asked Questions