- Uncertain
- Scam
Community reports for 0402 997 743 (0402997743) describe silent calls and Coinbase impersonation scam attempts on this Optus mobile number.
Silent Calls and Impersonation Reports for 0402 997 743
Three contributors have reported activity from 0402 997 743 (also written as 0402997743), an Optus mobile number. The reports reveal two distinct patterns: silent calls with no one speaking on the line, and at least one confirmed impersonation scam attempt. A contributor who answered a call from 0402 997 743 heard only silence, a common tactic used in callback scams and robocall campaigns. More concerningly, another contributor received a call from 0402997743 with a caller claiming to represent Coinbase, the cryptocurrency exchange. The contributor contacted Coinbase directly and confirmed the company does not initiate calls in this manner and advised hanging up immediately.
What Callers from 0402 997 743 Say
The impersonation attempt involving 0402 997 743 is particularly noteworthy because the caller claimed affiliation with Coinbase, a major financial platform. This type of impersonation targets cryptocurrency users and account holders who may be vulnerable to urgent-sounding requests for account verification, password resets, or security alerts. Silent calls from 0402997743 fit a known pattern where callers test whether a number is active and monitored, often as a precursor to callback scams or follow-up phishing attempts.
One contributor also mentioned a call claiming to be from Insight, though the intent and legitimacy of that call remain unclear. The contributor was uncertain whether it was a genuine survey or something else, but the vague nature and unsolicited nature suggest caution.
Report Patterns and Timing
Reports for 0402 997 743 span from May 2025 to December 2025, indicating this number has been active in problematic calling for several months. The silent call was the most recent report (December 2025), while the Coinbase impersonation attempt dates back to May 2025. The presence of both silent calls and impersonation attempts on the same Optus mobile number suggests the number may be compromised, spoofed, or actively used for multiple scam campaigns.
What to Do If You Receive a Call from 0402 997 743
If 0402 997 743 calls you:
- Do not: Answer if you don't recognise the number, engage with the caller, or return a callback to any number they provide
- Do: Let it go to voicemail, block the number immediately in your phone settings, and save it to your contacts as a known scammer or spam number
- For silent calls: Do not stay on the line or press any keys - simply hang up. Staying on the line or pressing keys confirms your number is active and may result in more calls
- For impersonation attempts: Never provide personal information, account details, passwords, or security codes. If someone claims to be from your bank, Coinbase, or any financial service, hang up and contact that organisation directly using the official number on their website
- Verify independently: If a caller claims to represent a company you use, end the call and ring that company's official customer service number (from their official website or your account statement) to verify whether they initiated contact
How to Report 0402 997 743
Report this number to Australian authorities and telecommunications regulators:
- ACMA (Australian Communications and Media Authority): Report the call at acma.gov.au - provide details of the date, time, caller behaviour, and any claims made
- Scamwatch: Lodge a report at scamwatch.gov.au if you believe this is a scam attempt. Include information about what the caller claimed and any financial or personal information requested
- Coinbase (if targeted): If you use Coinbase, report this impersonation attempt directly through your account's security settings or contact Coinbase support
- Your mobile provider: Contact Optus directly to report the number as a source of scam or nuisance calls - they may be able to block it network-wide or investigate whether the number has been spoofed
- Reverseau: Contribute your own experience with 0402 997 743 or 0402997743 to help other Australians identify and avoid this number
Help others by sharing your experience with 0402 997 743!
WRITE A REVIEWRatings Distribution
What Our Users Reviewed
Missed call, nothing on the machine
Three missed rings recently, flagged as spam by my phone
Ringing claiming to be from a health institute, scam
Picked up but just silence on the other end
Claimed to be from Insight, might have been a survey but honestly no idea
Caller claiming to be from Coinbase, contacted Coinbase and they confirmed they never call like that, advised to hang up
Help others by sharing your experience with 0402 997 743!
WRITE A REVIEWFrequently Asked Questions
What does a silent call from 0402 997 743 mean?
Silent calls where no one speaks on the line are commonly used in callback scams and robocall testing. When you answer 0402997743, the caller is verifying that your number is active and monitored. This information is often sold or used to intensify scam campaigns targeting your number in the future. Hang up immediately and do not press any keys or stay on the line.
Is 0402 997 743 really Coinbase calling?
No. A contributor confirmed with Coinbase directly that the company does not initiate unsolicited calls like this. Coinbase and other legitimate financial services contact account holders through secure in-app messaging or official emails, never cold calls claiming urgency. If 0402997743 calls claiming to be Coinbase, it is a scam impersonation attempt.
Should I call back 0402997743 if I missed a call?
No. Calling back 0402997743 is exactly what scammers want. If the call was important, the legitimate caller will leave a voicemail message. Never return a call to a number you don't recognise, as you may be confirming your number to scammers or incurring charges on premium lines. Block 0402 997 743 instead.
Why would someone claim to be from Coinbase on 0402 997 743?
Cryptocurrency exchange impersonations target users who hold accounts and may be vulnerable to urgent-sounding claims about security alerts, unusual activity, or account verification needs. A scammer calling from 0402997743 might ask you to verify login credentials, enable remote access, or transfer funds to a 'secure' wallet. Always verify by contacting Coinbase independently using their official website or app.
How do I block 0402 997 743 on my phone?
On most smartphones, open your Phone app, find the call from 0402 997 743 in your call history or missed calls, and select 'Block' or 'Block Number'. On iPhone, swipe left on the number and tap 'Block this Caller'. On Android, tap the info icon next to 0402997743 and select 'Block'. Once blocked, calls from 0402 997 743 will go straight to voicemail without ringing.
What should I do if I already gave information to a caller from 0402997743?
If you provided personal details, banking information, or passwords to a caller claiming to be from Coinbase or another service, contact that organisation immediately using the official number on their website. Change your passwords for all financial accounts, monitor your statements for unauthorised activity, and consider placing a fraud alert with your bank. Report the incident to Scamwatch (scamwatch.gov.au) and ACMA (acma.gov.au) so authorities can track the scam.