Is SMS 2FA Secure? SIM Swap, SS7 and When SMS Codes Still Make Sense

SMS two-factor authentication is far safer than a password alone but has known weaknesses. Here is what the risks are, what NIST says, and how to use SMS codes safely.

How to Choose a Verify API for Phone Verification and 2FA

A practical checklist for choosing a Verify API for phone verification and 2FA, with the tests, metrics and vendor questions that show real differences before you commit.

Build a Multichannel OTP Flow With Smart Fallback: SMS, WhatsApp, Viber, Email and TOTP

A practical guide to multichannel OTP design: choosing the first channel, setting fallback windows, where email and authenticator apps belong, and how fallback is billed.