0421 200 451 - 0421200451: Telstra Tech Support Scam

• Scam

0421 200 451 (0421200451): Contributors report calls impersonating Telstra employees claiming computers infected with viruses, requesting remote access.

Telstra Tech Support Impersonation Reports for 0421 200 451

Three contributors have reported calls from 0421 200 451 (also written as 0421200451) impersonating Telstra employees. The callers falsely claim to be internet security agents or Telstra staff, alleging that the recipient's computer is infected with viruses and requires urgent protection. One contributor explicitly noted their computer works fine, indicating the claims are fabricated.

All reports from 0421200451 follow an identical pattern: the caller identifies as a Telstra representative, invents a virus threat, and attempts to convince the recipient that immediate action is needed. This is a remote-access tech support scam designed to gain control of your computer.

What Callers from 0421 200 451 Claim

Contributors receiving calls from 0421 200 451 report the caller uses two main approaches. Some say they are "a Telstra employee" or "internet security" agent. Others describe themselves as "net security agents." In all cases, the caller claims the recipient's computer has been infected with viruses and needs "urgent protection."

The language used suggests urgency and authority. One contributor noted the caller said his computer "needed urgent protection," a classic pressure tactic to bypass rational decision-making. Another reported the caller insisted the computer "was infected with viruses," despite the recipient knowing their system was functioning normally.

None of the reports indicate the caller asked for payment upfront, suggesting the scam progresses to requesting remote access to the computer in order to "fix" the alleged infection. Once remote access is granted, scammers can install malware, steal banking credentials, or harvest personal data.

Call Patterns and Timing

All three reports of 0421200451 came through answered calls, meaning contributors picked up and spoke with the caller. The reports span from late May 2026, with two reports arriving within seconds of each other on May 30, and another on May 26.

The rapid succession of identical reports suggests this number may be part of an automated calling campaign or a single operator making multiple calls in quick succession. Contributors reported the calls came through as answered calls rather than voicemails, indicating the scammer is actively trying to reach and engage people in conversation.

What to Do If You Receive a Call from 0421 200 451

If 0421 200 451 calls you, remember that Telstra will never call unsolicited claiming your computer is infected or asking for remote access:

• Do not: Answer or engage with the caller, provide any personal information, allow remote access to your computer, or click any links they provide
• Do: Hang up immediately, block the number on your phone, verify any legitimate technical issues by contacting Telstra directly using the official number on your bill or their website
• Do: Check your computer yourself or take it to a trusted local technician if you have genuine concerns

If you've already given this number remote access to your computer, disconnect from the internet immediately, change your banking passwords from a different device, and contact your bank to report the incident.

How to Report 0421 200 451

Report this scam number through official Australian channels:

• Scamwatch (scamwatch.gov.au) - Report the scam and view similar reports from other Australians
• ACMA (acma.gov.au) - Report the call to the Australian Communications and Media Authority for investigation
• Telstra directly - Contact Telstra's fraud team to report the impersonation
• Reverseau - Share your experience on this page to help warn other Australians about 0421200451

If you blocked the number or saved evidence of the call (screenshots, call logs), include these details in your report.

Frequently Asked Questions