Appears to be a utility scam.
Utility Scam Alert! - +44 20 3921 0138 (020 3921 0138)
Summary — +442039210138
Expert Opinion
Like weeds choking a garden, these persistent calls can overrun your peace if left unchecked. Reports highlight a pattern of unwanted intrusions from this number, often flagged as scams or harassment, particularly linked to utility pretences or relentless pestering. Block it immediately on your device and register with the Telephone Preference Service to cut down on such nuisances. If you've shared any details, monitor your accounts closely and report to Action Fraud. Enabling call screening features on your phone adds another layer of defence—stay vigilant to keep the rot at bay.
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Rate this number — +442039210138
Recent Reports for 020 3921 0138
I'm exhausted by the endless scam calls we keep receiving.
I missed a call on my mobile and have now blocked the number.
I assumed it was a scam, so I used your service to flag the number as fraudulent. Thanks for the assistance.
Another number to watch: 0203 921 0136.
A further AQL call arrived from a different number; I blocked it via my phone/network.