Operations BroadNet answer

What is smishing?

Last reviewed July 22, 20261 min readReviewed by BroadNet engineering

Quick answer

Smishing (SMS phishing) is a fraud technique where attackers send SMS impersonating banks, government agencies, or delivery services to trick recipients into clicking malicious links, revealing credentials, or paying fake fees. Because people are conditioned to trust and act quickly on SMS from brands, smishing is highly effective. Defence is layered: operator SMS firewalls, sender-ID registration and anti-spoofing, URL reputation, and subscriber education.

Plain-language definitionVendor-neutralReviewed July 22, 2026

DiagramWhere an SMS firewall sits in the operator network

Inbound A2P and interconnect trafficFrom aggregators and international partners
SMS firewallInspects every message in real time
Operator SMSCOnly clean traffic is delivered
Subscriber handset

Grey routes, spoofed sender IDs and spam are blocked
Legitimate A2P traffic is identified and billed

The long answer

Everything worth knowing, nothing that isn't.

§01

Why smishing works

SMS is a trusted, high-open-rate channel, messages are short and urgent ('your parcel is held', 'confirm this transaction'), and the sender field is easy to spoof on grey routes — so a fake 'from' can mimic a real bank. The combination of trust, time-pressure, and spoofability makes smishing one of the most cost-effective attacks going. See /answers/what-is-sender-id-spoofing and /answers/what-is-grey-route-sms.

§02

How operators fight it

The operator SMS firewall inspects content and URLs, enforces sender-ID whitelists, blocks known malicious shorteners, and shares fraud intelligence through GSMA channels. Verified-sender channels such as RCS Business Messaging remove spoofing entirely by cryptographically binding the brand to the message. See /operators/sms-firewall and /answers/what-is-rcs-business-messaging.

BNWritten by the BroadNet engineering team·Operating carrier-grade messaging since 2003, headquartered in Dubai·Editorial standards

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