Smishing is treated as an inbox problem. It isn't. The text can look ordinary. The abuse is in how the message is injected: sender identity spoofed over SS7, A2P grey routes slipping past the SMSC. A content filter reads the words, never the origin or route. Catching SMS fraud at scale needs signalling-layer visibility, not better wordlists. https://www.p1sec.com/blog/sms-based-attacks-the-hidden-threat-still-exploiting-mobile-networks #TelecomSecurity #SS7 #Smishing