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Explore our getting started guide
Multi Factor (2FA) Authentication consolidated and automated. Receive
your account verification codes all in Slack and access your shared accounts easily, and securely.
Phone numbers are real US mobile numbers that will work with all major online
Receive a verification code in a private or shared Slack channel via SMS or
voice call instantly and securely.
Use numbers on any website and speed up login with your partners and
employees by sharing MFA in
If you’re sharing a login with someone, there isn’t an easy way to
properly secure your account - until now. Enable two-factor authentication and receive verification codes
right in Slack.
Get started by adding the app to your Slack workspace.
Generate a unique virtual or mobile phone number that belongs only to you.
Turn on two step verification on your various online accounts.
A verification code will be sent to your Slack channel via text or voice call.
All non-voip numbers are USA based and will work with any service.
Refer to our support documentation
for a full breakdown
All Non-VoIP numbers are USA based real phone numbers that will work with ALL online
We support both VoIP and Non-VoIP phone numbers. All plans include unlimited
Non-voip plan is based on 100 SMS codes per month. If you require more reach out to support.
We know there's a lot to learn and read about all that Clerk can do. Here are some of
the most frequently asked questions.
SMS verification, or SMS two-factor authentication (2FA) and SMS one-time
password (OTP), allows users to verify their identities with a code that is sent to them via text
This is real mobile number that is associated with a physical sim card. Highly secure services such
as Banks, Facebook, LinkedIn will only send a verification sms to a non virtual number.
Absolutely. We can send the verification SMS direct to your email address, or any webhook.
If you are unable to receive SMS verification codes most likely the service you are enabling MFA on
does not accept VOIP phone numbers. You will need to request a Clerk non-voip number.
Yes. Most existing internet services such as Google, Apple, and others allow the use of a US based
phone number for verification purposes.
Absolutely. Please reach out to email@example.com and we will get back to you asap.
*Chat with us! Talk to a real customer success specialist, respond in less
than 90 seconds hours 6:00 am PST - 9:00 pm PST