- Scam
- Uncertain
Community reports for 04 2107 7137 (0421077137): SMS scam requesting personal details after claiming unauthorised charges. Optus mobile number.
Personal Information Request Scam via 04 2107 7137
Two contributors have flagged SMS messages from 04 2107 7137 (also written as 0421077137) for suspicious activity. The reports indicate a pattern of text-based scams designed to trick recipients into revealing personal information by claiming unauthorised transactions.
One contributor received an SMS from 0421077137 asking if they had made a $900 charge, then requesting personal details to "verify" the transaction. A second report describes a similar message from 04 2107 7137 claiming a card had been used at Sportsbet, with language the contributor described as "dodgy." Both messages appear designed to create urgency and concern that would prompt a quick response with sensitive information.
What Callers from 04 2107 7137 Say
The SMS scam from 04 2107 7137 follows a common pattern: the sender claims knowledge of a recent transaction the recipient did not make, then uses that claim to justify requesting personal information. One message referenced a specific $900 charge. Another tied the claim to a gambling site (Sportsbet), likely chosen because it carries social stigma that might make recipients less likely to discuss the message or verify it with others.
Contributors note the messages are brief and designed to provoke immediate concern rather than provide genuine detail. The vague nature - not specifying exact card type, account details, or merchant name beyond the Sportsbet reference - is typical of mass SMS scams sent to large lists of phone numbers.
Report Patterns and Timing
Both reports about 0421077137 came via SMS rather than voice calls, which is consistent with modern scam tactics. SMS-based fraud reduces the risk of the scammer being questioned in real-time, as the target must respond by text or phone call rather than interact with a live person who might contradict details.
The reports span roughly ten days in October 2025, suggesting either ongoing scam activity from this number or separate scam campaigns using similar messaging. The allocation data shows 04 2107 7137 is registered as an Optus mobile number, which scammers often prefer because mobile-originated SMS can appear more legitimate than obvious business numbers.
What to Do If You Receive an SMS from 04 2107 7137
If you receive a text from 04 2107 7137 or 0421077137 claiming unauthorised charges or asking for personal information:
- Do not: Reply to the message, call the number, click any links, or provide personal details like card numbers, CVV, passwords, or ID information
- Do: Contact your bank or card issuer directly using the phone number on the back of your card or your statement
- Do: Block the number immediately in your phone settings
- Do: Delete the message without engaging further
- Do: Report the SMS to your telco and to Australian authorities
Legitimate banks and financial institutions will never ask for sensitive information via SMS. They have your details on file and verify transactions through secure channels, not text messages.
How to Report 04 2107 7137
If you receive scam SMS messages from 04 2107 7137, report them through official Australian channels:
- Forward to ACMA (Australian Communications and Media Authority): Forward the SMS to 0429 999 888 with as much detail as possible. ACMA investigates telecommunications-based fraud and scams.
- Report to Scamwatch: Lodge a report at scamwatch.gov.au with details of the message content, timing, and any response you gave. Scamwatch tracks scam trends and provides warnings.
- Notify your telco: Contact Optus directly to report the scam SMS, as the number may be spoofed or fraudulently registered.
- Block and report in your phone: Use your phone's native spam-reporting feature to flag the number.
- Report on Reverseau: Submit a community report here so other Australians can identify this scam number.
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WRITE A REVIEWRatings Distribution
What Our Users Reviewed
Text asking if I made a $900 charge, wants personal info
Message claiming card was used at Sportsbet, bit dodgy
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WRITE A REVIEWFrequently Asked Questions
Should I reply to the SMS from 04 2107 7137 to tell them I didn't make that charge?
No. Do not reply to 04 2107 7137 or 0421077137 under any circumstances. Replying confirms your number is active and monitored, which encourages more scam attempts. Scammers also use replies to gather information about you. Instead, block the number and report it to ACMA at 0429 999 888.
What if the SMS from 0421077137 mentions my actual bank or card?
It's still a scam. Scammers often include real bank names or card providers in their messages to appear legitimate. Never respond to the SMS or call any number in the message. Hang up immediately if you call back. Instead, contact your bank directly using the number on your card or statement to verify whether any unauthorised transactions actually occurred.
Is 04 2107 7137 definitely a scammer's phone, or could it be compromised?
The number 04 2107 7137 is registered as an Optus mobile, but scammers commonly spoof legitimate mobile numbers or register burner accounts. The consistent pattern of personal information requests in the reports suggests deliberate scam activity rather than an innocent account being misused. Either way, do not engage with the number.
What information should I give if I accidentally reply to 0421077137?
If you've already replied, do not send any personal information. Block the number immediately and monitor your bank accounts for unauthorised activity. Change your passwords for financial apps and online banking. Contact your bank directly using the number on the back of your card to report the scam and ask them to monitor for fraud.
Why would a scammer use a mobile number like 04 2107 7137 instead of a business number?
Mobile numbers like 04 2107 7137 (from Optus mobile) appear more personal and trustworthy than obvious business lines, making recipients more likely to respond. They also cost less to register and easier to discard once the scam campaign ends. Scammers choose mobile numbers to increase response rates and avoid immediate detection.
Should I report this to my bank, or is ACMA at 0429 999 888 enough?
Do both. Report the SMS from 04 2107 7137 to ACMA at 0429 999 888 and to Scamwatch at scamwatch.gov.au for the crime to be tracked. Then contact your bank directly using the number on your card to alert them of the scam attempt and ask them to monitor for fraud. Your bank may be able to identify patterns across multiple customers receiving similar messages from 0421077137.