It could be a costly phone call if you do.
Dubliners have been warned not to call back if they receive a call from a +231 number.
Many people in the capital and nationwide have been reporting getting phone calls from the international code +231 which is Liberian.
The Communications Regulation said they are aware of this particular scam and that people should not call back.
The scam charges a caller a premium if they do happen to call back.
A spokesperson for the watchdog said: "ComReg is aware that scam calls can take on many forms therefore ComReg advises consumers to be vigilant at all times.
"We would advise consumers that returning calls to unknown international numbers can be costly and we advise consumers to exercise caution when they receive a missed call from such numbers."
Here's ComReg's full advice if you get a call;
- Be wary of multiple calls/missed calls being received from the same number that you are unfamiliar with
- Do not call back any number that you don’t recognise where there is a blank or no voicemail message left
- If you dial back one an unknown numbers by mistake – hang up immediately, on calls where there appears to be no recipient on the other end or where you are left on hold
- If you have friends or relatives abroad that may be calling you, store their number (including the country prefix) in your phone and be aware of the prefix for the country where they might be calling from
- If you are getting persistent missed calls from an unknown number, contact your operator in the first instance
- Do not provide any personal information for example – banking details PPS number/credit card details/name and address/passport numbers etc.
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