Beware of the 400 prefix: it has just been introduced for commercial calls and there are already warnings about a telephone scam.

Authorities and citizens have issued warnings regarding a new telephone scam involving the recently introduced 400 prefix for commercial calls. The alert follows a reported incident in Puente Genil, Córdoba, where a resident filed a complaint after receiving a suspicious call from a number utilizing this new commercial prefix.

The case exposes vulnerabilities linked to the rollout of the new numbering system for commercial communications, prompting early alarms about fraudulent activities. The incident highlights the immediate security risks emerging alongside the adoption of the 400 prefix for telemarketing purposes.