Clerk’s Multi Factor Authentication or OTP app supports both Virtual and Non-VoIP phone numbers for SMS verification from all major online platforms.
Clerk’s Two Factor Authentication (or Multi-Factor) Authentication (MFA) app allows you to receive verification codes from any online service. Clerk supports both virtual and non-voip phone numbers. Use clerk on any website and speed up login with your partners and employees by receiving one time passwords and verification codes.
Online SMS Verification
Shared Multi-factor Authentication
Use Numbers on Any Website
Create Unlimited Numbers
Receive Verification Codes in Seconds in:
Virtual Phone Numbers
A VoIP number, also known as Voice over IP number, is a virtual phone number that works with most of online services to receive one time passwords (OTP), but not all. A number of services can work with a virtual phone number via voice transcription.
Note: By default when you provision a Clerk phone number in Slack you get assigned a virtual phone number.
Non VoIP (Real) Phone Numbers
Non-VoIP or Real phone numbers are usually required by highly sensitive websites such as banks, Facebook, Linkedin... This type of phone number will work with ALL online services.
All Clerk Non VoIP numbers are USA based real phone numbers that will work with ALL online services.
Limitationsof Non VoIPNumbers: These types of phone numbers are designed for receiving verification codes only. The numbers are only able to receive inbound SMS. To take advantage of the add-ons below get an additional VoIP phone number.
Inbound SMS only
No Call Forwarding
Refer to the following table for a breakdown of some of the popular supported services.