Blog: security, scams, and phone spam
Content from the NoCall team to understand real threats, spot patterns, and make informed decisions.
AI-cloned voices in phone scams: what's real and how to defend yourself
AI can already mimic a relative's voice from just a few seconds of audio. We explain what's real, how it works and how to protect yourself.
SIM swapping: the SIM duplicate fraud and how to protect yourself
SIM swapping clones your number onto another card to steal your bank's text messages. We explain how they do it, the warning signs and how to shield yourself.
An X-ray of phone spam in Spain: what NoCall's data says
This is how we measure phone spam at NoCall: what data we publish, where it comes from and how you can read it yourself to protect yourself better.
Quishing: scams with QR codes and links in text messages
Quishing hides fraud inside a QR code you scan with confidence. We explain how it works and how not to fall for it.
What to do if you receive a call from an unknown international number
A step-by-step protocol for a call from a foreign prefix you weren't expecting: don't call back, verify the country and block sensibly.
Which mobile prefixes get the most spam reports in Spain
Why legitimate 6xx and 7xx ranges end up in scammers' hands, how to read a mobile prefix and what to do when one calls you.
Which operators concentrate the most numbers reported as spam
We analyse by operator and prefix which ranges concentrate the most spam numbers in Spain and why portability and virtual lines explain it.
Phone threat report for Spain (second quarter of 2026)
Quarterly summary of the most active phone fraud campaigns in Spain, with data from NoCall and official reporting channels.
Ping calls and flash calls: when a number rings you and hangs up to slip you a code
Flash calls and ping calls hang up instantly, but they're not after you calling back: they abuse your number to verify codes or generate traffic.
Parcel scams: the fake Correos, SEUR and customs text message
The "parcel held" text asking you to pay a fee is smishing. We show you how to spot it, the fake domains and how to verify a real shipment.
How to verify whether a call or text from your bank is real
Learn how to check step by step whether a message or call from your bank is legitimate using verified channels, the official app and the rule of never giving out your keys.
How to verify a notification from the Tax Agency or Social Security
Learn to tell a genuine notification from the Spanish Tax Agency or Social Security apart from a scam, using only the official channels and Cl@ve.