- Scam
- Suspicious
02 8381 5646 (0283815646): Community reports describe Coinbase impersonation calls and SMS phishing attempts requesting account access verification.
Coinbase Impersonation and Phishing Reports for 02 8381 5646
Three contributors have flagged 02 8381 5646 (also written as 0283815646) for scam activity combining fake cryptocurrency exchange impersonation with phishing tactics. Two reports describe direct scam attempts, while a third contributor's phone system flagged the number as suspicious before the call was answered.
The reports indicate callers from 0283815646 are attempting to compromise cryptocurrency account access through a combination of impersonation and interactive voice response (IVR) tricks designed to isolate victims and extract sensitive information.
What Callers from 02 8381 5646 Say
One contributor who answered a call from 02 8381 5646 reported the caller claimed to represent Coinbase and referenced an account issue requiring immediate verification. The caller instructed the recipient to press 1 to reach support, a common tactic to confirm the line is active and route the call to a live scammer. Notably, the contributor did not have a Coinbase account, suggesting the scammers are using broad contact lists without validating target profiles.
A separate report describes an SMS from 0283815646 claiming a phone number had changed and asking the recipient to press 1 to chat. The message's informal phrasing and pressure to engage via keypad input are typical phishing techniques designed to trigger automated systems that capture confirmation of active numbers for resale or further targeting.
Report Patterns and Timing
All three reports about 02 8381 5646 arrived within a narrow 4-hour window on 18 January 2026, with the SMS report at 08:57 UTC and the call report at 08:00 UTC, suggesting a coordinated campaign. The call came during business hours when people are more likely to answer unfamiliar numbers. One contributor received a missed call that their phone system had already flagged as suspicious, indicating the number may have a history of flagging across multiple carrier networks.
What to Do If You Receive a Call from 02 8381 5646
If 02 8381 5646 calls you:
- Do not: Press any keys when prompted, confirm your account status, or share personal information such as passwords, security codes, or payment details
- Do not: Return the call or attempt to verify the caller's identity by calling them back
- Do: Hang up immediately and block the number
- Do: If you have a Coinbase account, contact Coinbase directly using the phone number or website from your official account statements to verify any genuine alerts
- Do: Note that legitimate financial institutions never request sensitive credentials via unsolicited calls
What to Do If You Receive an SMS from 02 8381 5646
If you receive a text message from 0283815646:
- Do not: Click any links in the message or reply with any information
- Do not: Press 1, respond with numbers, or engage with any prompt in the SMS
- Do: Delete the message immediately
- Do: Mark it as spam in your phone's messaging app
- Do: Forward the message to 0429 999 888 (ACMA's SMS spam reporting service) and include the sender number 0283815646
- Do: Block the number to prevent further contact
How to Report 02 8381 5646
If you receive scam calls or SMS messages from 02 8381 5646, report them to Australian authorities:
- Report to Scamwatch at scamwatch.gov.au - include details of what the caller claimed and any requests made
- Report to the Australian Communications and Media Authority (ACMA) at acma.gov.au - provide the phone number 0283815646, date, time, and nature of contact
- Report SMS phishing to ACMA by forwarding the message to 0429 999 888
- If you shared any financial information, contact your bank and any cryptocurrency exchanges where you have accounts
- Report the number on Reverseau to contribute to the community intelligence about 02 8381 5646
Help others by sharing your experience with (02) 8381 5646!
WRITE A REVIEWRatings Distribution
What Our Users Reviewed
Message saying phone number's changed, asking to hit one to chat, don't fall for it
Claimed to be Coinbase saying something about my account, told me to press 1 for support. I don't even have Coinbase
Phone labeled this suspicious caller so decided give it miss. curious who it was
Help others by sharing your experience with (02) 8381 5646!
WRITE A REVIEWFrequently Asked Questions
Why did a caller from 02 8381 5646 claim to be from Coinbase when I don't have an account?
Scammers using 0283815646 often use broad contact lists without verifying whether targets actually use the service they're impersonating. This increases their odds of finding someone with an account while also testing which numbers are active. The fact that you don't have a Coinbase account is actually a protection - the caller cannot access any real account information about you.
What happens if I press 1 when prompted by a call from 02 8381 5646?
Pressing 1 in response to a prompt from 0283815646 confirms to the scammer's system that your phone number is active and monitored by a real person. This makes your number more valuable for resale to other scammers or for escalation to live operators who will attempt social engineering. It's why you should hang up immediately instead of engaging with any prompts.
Is 02 8381 5646 actually calling from Coinbase?
No. 0283815646 is registered to Primus Telecommunications in NSW, not to Coinbase. Coinbase would not use an Australian local number for US-based account support. Legitimate financial institutions never cold-call about account issues - they contact you through your official account portal or a number you've verified independently on their official website.
What should I do if I already engaged with a call from 02 8381 5646?
If you pressed 1 or provided any information to a caller from 0283815646, block the number immediately and monitor your accounts. Check your Coinbase account (if you have one) and any cryptocurrency exchange accounts for unauthorised activity. Contact your bank if you shared financial information. Change passwords on important accounts and consider placing fraud alerts with your bank.
Why did the SMS from 02 8381 5646 say my phone number had changed?
The SMS claiming your phone number changed is a social engineering tactic. By suggesting something unexpected happened to your account or device, it creates urgency and tries to make you press 1 to 'verify' or 'confirm'. Legitimate services never ask you to press keys in response to SMS - they direct you to log into secure accounts or call official numbers.
Should I forward the SMS from 0283815646 to 0429 999 888?
Yes. Forward any SMS from 02 8381 5646 to 0429 999 888, which is ACMA's dedicated SMS spam and phishing reporting number. Include the original sender number 0283815646 in your report. This helps ACMA track patterns and take action against the service provider if the number is being abused.