Telecom fraud is scam activity that abuses voice, SMS, or phone infrastructure to deceive targets and extract money, credentials, or sensitive information. Common forms include caller-ID spoofing, robocalls, premium-rate scams, SIM swapping, and vishing, where an attacker uses a phone call to create trust and urgency.
It matters in cyber security because phone systems are often treated as authoritative, making them useful for social engineering and account takeover. Fraudsters may impersonate banks, delivery services, or law enforcement to pressure a victim into revealing one-time codes or approving a transfer. Defenses focus on caller verification, anti-spoofing controls, call analytics, customer education, and stronger authentication that does not rely only on voice trust. In practice, telecom fraud is less about exploiting code than exploiting the credibility of the channel itself.