Diagnostic Guide

Evidence-Based SMS Delivery Diagnostic Tree

Why did your verification code fail to arrive? Identify carrier spam filters, VoIP restrictions, and 10DLC campaign rules.

Sender Type Bank / Financial Institution (2FA OTP) 5-6 Digit Short Code (e.g. 22395) International Application (Telegram, WhatsApp, Google)

Receiving Number Type Virtual / VoIP Long Code Standard Mobile Long Code

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