0421 429 355 - 0421429355: Threat and Silent Call Reports

• Scam
• Spam
• Unknown

0421 429 355 (0421429355): Community reports include extortion threats, silent calls, and unwanted sexual content. Optus mobile number flagged as scam and nuisance.

Threat and Silent Call Reports for 0421 429 355

Three contributors have reported concerning activity from 0421 429 355 (also written as 0421429355), an Optus mobile number. The reports reveal a pattern combining extortion threats with persistent silent calls and unsolicited sexual content. One contributor received a voicemail from someone claiming to be a sex worker, making explicit threats to contact family members unless money was sent. Two additional reports describe either repeated silent calls or unwanted SMS messages of a sexual nature.

The allocation data confirms 0421429355 is registered as a mobile number with Optus, making it a personally-held device rather than a business line. This matters because the number may have been compromised, stolen, or is being used deliberately for harassment.

What Callers from 0421 429 355 Are Doing

The most serious report about 0421 429 355 describes an extortion attempt. A contributor received a voicemail claiming to be from a sex worker threatening to contact the contributor's wife unless money was transferred. The caller appeared to have no prior relationship with the recipient and made assumptions about family structure - the contributor noted the threat was illogical given they are gay. This is a classic sextortion or blackmail approach: creating false claims of sexual involvement and leveraging family shame as pressure.

A separate report about 0421429355 describes a different harassment pattern: repeated calls followed by long silences with no one speaking. The contributor answered the call, confirming the caller was present but refused to engage. This silent call behaviour is often associated with either callback scams (where silence prompts you to call back, triggering premium charges) or harassment/intimidation tactics.

The third report mentions receiving an SMS from this number containing sexual content, sent to a minor. The contributor expressed particular concern about the unsolicited nature and the fact a child received the message.

Timing and Call Patterns

Reports about 0421 429 355 span two months, from late January through early March 2026. One report notes the silent calls from 0421429355 occurred repeatedly, suggesting a deliberate harassment campaign rather than accidental contact. The extortion voicemail was received during a one-week window, and the SMS harassment occurred in late January. This spread across different channels (voicemail, live calls, SMS) suggests either multiple people using the same number or a coordinated harassment effort.

What to Do If You Receive a Call from 0421 429 355

If 0421 429 355 calls you:

• Do not engage: Hang up immediately if you hear silence or threats. Do not respond to questions or acknowledge you're listening.
• Do not provide information: Never confirm your name, family details, or relationship status. Scammers use any detail to refine their approach.
• Do not call back: Silence or dead air can be a callback scam tactic. If you feel compelled to respond, call a known family member or authority instead.
• Do block the number: Add 0421429355 to your phone's blocked list immediately to prevent repeated calls.
• Do preserve evidence: Keep voicemails, screenshots of SMS, and call logs. These are crucial for reporting.

What to Do If You Receive an SMS from 0421 429 355

If you receive an SMS from 0421 429 355:

• Do not click links: Sexual content messages often contain malware links. Do not open URLs or download attachments.
• Do not reply: Responding confirms your number is active and monitored, encouraging more messages.
• Do report as spam: Forward the SMS to 0429 999 888 (Australian spam reporting), then delete the message.
• Do block the sender: Add 0421429355 to your blocked contacts to stop further SMS.
• If a child received it: Keep the message as evidence and report to the eSafety Commissioner at esafety.gov.au.

How to Report 0421 429 355

Multiple reporting pathways exist for this number:

• Report extortion or threats: Contact the Australian Federal Police (AFP) via ReportCyber at cyber.gov.au or call 1300 CYBERCRIME (1300 292 237). Extortion and sextortion are serious crimes.
• Report harassment: Lodge a complaint with the Australian Communications and Media Authority (ACMA) at acma.gov.au. Include your call/SMS logs and the date/time of contact.
• Report unwanted contact: Check if 0421429355 is on the Do Not Call Register at donotcall.gov.au. If it's a known business breaching the register, file a complaint there.
• Report to Optus directly: Contact Optus customer service to report abusive activity from their network. The mobile account holder may not know their number is compromised.
• Contribute to Reverseau: Add your own report about 0421 429 355 to help other Australians identify this number and stay informed about emerging threats.

Frequently Asked Questions