Clerk SMS Verification

Clerk SMS verification lets you complete phone confirmation with a virtual number on the developer authentication platform Clerk.

Clerk is a developer-first authentication platform that adds ready-made sign-in and sign-up interfaces, multi-factor authentication, and user management to modern web and mobile apps. Both when you create a Clerk account and in apps that use Clerk's SMS one-time passcode (OTP) method, a phone number is requested to verify the user, and an SMS code is sent to that number.

To verify with a virtual number, you enter your virtual number on a Clerk-powered sign-in screen and type the SMS code it sends. This method is very useful in scenarios where developers need to test the SMS OTP flow, open an account without sharing a personal number, or use separate verification numbers for different environments.

Because Clerk is a security-focused identity infrastructure, enter the verification code only in the relevant official app or Clerk interface and never share it. While real user accounts should be protected in production, if you use a virtual number for testing, make sure those numbers belong to temporary test flows rather than permanent accounts.