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02 9788 7540 (0297887540): Community reports of robocalls impersonating Coinbase and silent calls with immediate hang-ups from Optus NSW number.
Robocall and Silent Call Reports for 02 9788 7540
Two contributors have reported suspicious activity from 02 9788 7540 (also written as 0297887540), an Optus local service number in NSW. The reports describe a pattern of automated robocalls and repeated silent calls designed to provoke callback responses. One contributor received a robocall falsely claiming unauthorised login activity on a Coinbase cryptocurrency account, while another experienced multiple hangup calls suggesting callback bait tactics.
The combination of robocall impersonation and silent call behaviour from 0297887540 indicates deliberate evasion tactics. Robocalls that claim account security breaches are designed to trigger panic and immediate action, while silent calls that disconnect on answer often attempt to generate return calls to premium-rate or scam numbers.
What Callers from 02 9788 7540 Claim
The robocall received from 02 9788 7540 specifically impersonated Coinbase security alerts. The caller claimed there had been a login attempt from Hong Kong on the recipient's cryptocurrency account, creating urgency and concern about account compromise. This is a common scam tactic targeting cryptocurrency users, as it exploits awareness of real account security threats while using false authority to extract verification details or direct victims to fraudulent login pages.
The second report about 0297887540 describes a different tactic altogether - immediate disconnection after the call is answered. The contributor noted this occurred repeatedly, suggesting systematic callback harvesting. These silent calls are typically used to identify active phone numbers for sale to other scammers or to generate callbacks to premium services.
Report Patterns and Timing
Both reports from 02 9788 7540 arrived within a 24-hour window in late November, suggesting a possible campaign or burst activity from this number. One contributor answered and heard the robocall message; the other answered to silence followed by disconnection. The variety in tactics (automated message versus silent call) from the same number indicates either multiple scam operations using the Optus allocation, or a sophisticated operation testing different approaches on the same number.
What to Do If You Receive a Call from 02 9788 7540
If 02 9788 7540 calls you:
- Do not: Answer unexpected calls from unknown numbers, click links sent via call-related messages, or return calls to numbers you didn't initiate contact with
- Do not: Provide any personal information, account details, or verification codes to callers claiming to be from Coinbase or any financial institution
- Do: Let the call go to voicemail if you don't recognise the number
- Do: If you receive a security alert about your Coinbase account, hang up and log into your account directly (not via any link) or contact Coinbase through their official website or app
- Do: Block 0297887540 immediately after the first suspicious call to prevent repeat contact
- Do: Be aware that legitimate financial institutions will never call unsolicited claiming urgent account issues - these are always scam red flags
How to Report 02 9788 7540
Report this number and your experience through these Australian resources:
- Scamwatch: scamwatch.gov.au - report cryptocurrency impersonation scams and robocalls
- ACMA (Australian Communications and Media Authority): acma.gov.au - report unwanted calls and silent calls
- ReportCyber: cyber.gov.au - report online scams including fake financial institution contact
- Your phone provider: Contact Optus directly to report the number for potential network abuse
- Reverseau: Help other Australians by contributing your experience with 02 9788 7540 on this page - your report helps identify patterns and protect others from this number
Help others by sharing your experience with (02) 9788 7540!
WRITE A REVIEWRatings Distribution
What Our Users Reviewed
Robocall claiming there was a login from Hong Kong to my Coinbase account
They call then hang up like it's a game
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WRITE A REVIEWFrequently Asked Questions
Why would a scammer call claiming to be Coinbase?
Cryptocurrency account takeovers are extremely profitable for scammers. By impersonating Coinbase on 02 9788 7540, callers aim to trick you into revealing your login credentials, two-factor authentication codes, or recovery phrases. Once they access your account from 0297887540's false alert, they can transfer your cryptocurrency immediately. This tactic works because Coinbase users are aware that real account security threats exist, making the false urgency believable.
What should I do if I already provided information to a caller from 0297887540?
If you shared account details, passwords, or verification codes with 02 9788 7540, act immediately. Log into your Coinbase account directly (do not use any link from calls or messages) and change your password. Enable or review two-factor authentication settings. If any cryptocurrency has been moved, contact Coinbase support and report the fraud to Scamwatch at scamwatch.gov.au. Document the exact time and date of the call from 0297887540 for your report.
Why do some calls from 02 9788 7540 just hang up?
Silent calls that disconnect immediately when answered are often used to verify that your phone number is active and monitored. Scammers buy and sell lists of active numbers, and each successful answer increases the value of your number on the underground market. Silent calls from 0297887540 may also be callback harvesting - they hope you'll call back out of curiosity, potentially reaching a premium-rate line or triggering your callback to a different scammer's number.
Could 02 9788 7540 be a legitimate Coinbase security alert?
No. Coinbase will never call you unsolicited claiming a security breach or suspicious login. Legitimate financial institutions contact you through methods you've pre-arranged, and they never ask for passwords, recovery phrases, or verification codes over the phone. If you're concerned about your Coinbase account, always log in directly through the official Coinbase app or website (not via links from calls), never through numbers or links provided by 0297887540.
Should I try to call back 0297887540 to verify if it's real?
No. Do not call back 02 9788 7540 or any unknown number. Calling back an unfamiliar number can connect you to premium services, confirmation systems for scammers, or further scam operations. If you're concerned about a security alert, contact the institution directly using the official contact number on their website or your official statement - never a number associated with the incoming call from 0297887540.
Why hasn't 02 9788 7540 been shut down if it's being used for scams?
Scammers often use legitimate phone numbers (or numbers allocated through carriers) by spoofing caller ID or compromising accounts. The Optus allocation to 0297887540 may not indicate that Optus is responsible - the number could be impersonated by offshore scammers using VoIP services. Reporting to ACMA (acma.gov.au) and your provider helps identify these patterns, but takedown can be slow. In the meantime, blocking the number on your device and warning others about 02 9788 7540 provides immediate protection.