# SMS verification glossary

Source: https://tempsmsverify.com/glossary · Last updated: 2026-10-23

The words around phone verification get used loosely. This glossary defines each one in plain English, explains how it works under the hood, and says what it means for your security, with sources and dates so you can check the facts yourself.

## What terms should I know before using SMS verification?

Start with six: OTP (a code that works once), 2FA (a second proof besides your password), SMS verification (a code sent by text), SIM swap (a scam that hijacks your number), and VoIP versus non-VoIP numbers (internet lines versus mobile-network lines). Together they explain why apps ask for a phone and when codes fail.

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TempSMSVerify · https://tempsmsverify.com