Blog: security, scams, and phone spam
Content from the NoCall team to understand real threats, spot patterns, and make informed decisions.
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.
How to protect older people from phone scams
A guide for families: spot the warning signs, raise the subject without alarming them, set up their phone and know what to do if your relative has already fallen for it.
How to block numbers on the landline and the switchboard of a small business
A practical guide to stopping phone spam on your landline and your company's VoIP switchboard: operator, blacklists and the Lista Robinson for businesses.
How to block spam calls on Android: a guide by manufacturer (Samsung, Xiaomi, Google)
Block phone spam on Android step by step depending on your skin: Samsung's One UI, Xiaomi's MIUI/HyperOS and Google's Pixel.
How to read a number's risk signals on NoCall
Learn to interpret the risk score, danger level and complaint patterns NoCall shows you so you can decide whether to pick up or not.
How a fraudulent call centre works from the inside
We show you the anatomy of a fraudulent call centre step by step: the script, the pressure, the urgency and the fake "security department" that ruins you.