- Legit
- Suspicious
Community reports for 07 5409 8640 (0754098640): Two contributors report silent calls that hang up immediately upon answering. Also flagged for clinical trial recruitment spam.
Silent Call Reports for 07 5409 8640
Two contributors have reported receiving calls from 07 5409 8640 (also written as 0754098640) that disconnect immediately when answered. This Queensland-based local number, allocated to Telstra Limited, exhibits a pattern of silent calls characteristic of robocall testing or callback scams where the caller hangs up deliberately.
The silent call tactic serves multiple purposes: scammers use it to verify active phone numbers for sale on the dark web, test answering machines for recorded greetings they can exploit, or trigger callbacks to premium-rate numbers. Two separate reports about 0754098640 document this exact behaviour, with contributors noting the call dropped the moment they said hello.
What Callers from 07 5409 8640 Do
Contributors who answered calls from 07 5409 8640 report immediate disconnection without any spoken interaction. One report states: "When I answered they hung up straight away." Another contributor noted: "Hanged up on answering." This silent-then-disconnect pattern differs from telemarketing or legitimate business calls, which typically connect to a person or automated message.
One contributor also reported receiving recruitment calls from this number claiming affiliation with USC Clinical Trials. While clinical trial recruitment itself is a legitimate activity, the juxtaposition with silent calls suggests the number may be used for multiple purposes or that spam operators have cycled through it over time.
Report Patterns and Timing
The silent call reports span two incidents in mid-2024 (June 10 and June 23). The spacing suggests either repeated testing of the number or a brief campaign period. The earlier spam report about USC Clinical Trials recruitment dates to September 2023, indicating the number 07 5409 8640 has been associated with outbound calling activity for at least 18 months.
One contributor independently verified that 0754098640 appears legitimate, suggesting the number itself may not be spoofed but rather legitimately allocated and subsequently misused or compromised for silent call campaigns.
What to Do If You Receive a Call from 07 5409 8640
If 07 5409 8640 calls you:
- Do not: Return the call, as this may trigger callback charges or confirm your number to scammers testing active lines
- Do: Let it go to voicemail and do not answer if called again
- Do: Block the number in your phone settings to prevent repeated calls
- Do: Be aware that silent calls are often part of callback scams where returning the number connects you to premium-rate lines
How to Report 07 5409 8640
If you receive unwanted calls from 07 5409 8640, you can report the number through Australian government channels:
- ACMA (Australian Communications and Media Authority): Report the silent call via acma.gov.au - provide the date, time, and nature of the call
- Do Not Call Register: Register your number at donotcall.gov.au to opt out of telemarketing calls, though this does not prevent silent calls
- Scamwatch: Report suspected scam activity at scamwatch.gov.au
- Reverseau: Share your experience with 07 5409 8640 to help other Australians identify this number
Help others by sharing your experience with (07) 5409 8640!
WRITE A REVIEWRatings Distribution
What Our Users Reviewed
Completely legit.
When I answered they hung up straight away
Hanged up on answering.
USC Clinical Trials recruitment.
Help others by sharing your experience with (07) 5409 8640!
WRITE A REVIEWFrequently Asked Questions
Why do callers from 07 5409 8640 hang up immediately?
Silent calls that disconnect when answered are typically robocall testing campaigns. Scammers use numbers like 07 5409 8640 to verify active phone numbers, which they then sell or use for future scam campaigns. By hanging up immediately, they confirm your line answers without leaving evidence of contact.
Is 07 5409 8640 a legitimate Telstra number?
The number 0754098640 is legitimately allocated to Telstra Limited as a Queensland local service. However, legitimate allocation does not guarantee safe use. One contributor confirmed 07 5409 8640 appeared legitimate when researched, but the silent call reports suggest it has been used for unwanted outbound calling campaigns.
Should I call back if 07 5409 8640 calls me?
No. Do not return calls from 07 5409 8640. Calling back silent numbers can trigger premium-rate charges, confirm your number to scammers, or connect you to international call centres. This is a common callback scam tactic.
What is the USC Clinical Trials recruitment call from 07 5409 8640?
One contributor reported receiving a recruitment call from 0754098640 claiming affiliation with USC Clinical Trials in September 2023. While clinical trial recruitment is legitimate, receiving such calls unsolicited may indicate the number has been used for spam campaigns. Always verify trial affiliation directly with the organisation, not through unsolicited callers.
Can I block 07 5409 8640 on my phone?
Yes. Most Australian mobile and landline services allow you to block incoming calls. Add 07 5409 8640 to your blocked contacts or use your provider's call-blocking service. For Telstra customers, you can manage blocked numbers through your account settings or use third-party apps like Nomorobo or TrueCaller.
Is 0754098640 associated with data breaches?
Community reports for 07 5409 8640 do not indicate personalised information was used in calls, unlike sophisticated impersonation scams. The silent call pattern suggests automated robocall activity rather than targeted fraud. However, if you've shared personal information with any unsolicited caller, monitor your accounts for suspicious activity.