How to port a number into Klaviyo

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Updated Aug 6, 2025, 12:00 AM EST

Table of contents

You will learn

Learn how to port an SMS sending number into Klaviyo.

Before you begin

Set up SMS in Klaviyo before you begin. You need permission to manage sending numbers, such as the Owner, Admin, or Manager role.

Please note that porting:

  • Can take several weeks, depending on the number type. When migrating to Klaviyo, build in time for the estimates in the Outcome section below.
  • Will result in the loss of any voice capabilities.
  • Requires approximately 2–5 business days of downtime when the number cannot be used (due to verification and carriers needing to re-route traffic to the number).

Types of numbers that can be ported
Type of number Can it be ported?
Toll-free Yes
Short code Yes
Shared short code No
Branded sender ID No, but you can set the ID to be the same as your previous one
Long code Yes in the UK, Ireland, and Australia

Port a toll-free number

If your Klaviyo account already has a toll-free number, or a request to add or port one is in progress, Continue is unavailable. Contact Klaviyo Support for help with the existing number or request.

  1. Navigate to Settings.
  2. Click SMS > Sender information.

SMS_sender_information.jpeg

SMS_sender_information.jpeg

  1. Click Port existing number.
  2. Select Toll-free number.
  3. Click Continue to open the port-request form in a new tab.

Modal to submit a port request

Modal to submit a port request

  1. Complete and submit the port-request form.

Port a short code

You cannot continue if the selected country already has a short code, including a vanity short code, or a request to add or port one is in progress. Contact Klaviyo Support for help with the existing number or request.

Before applying, review the short code application reference for the information and documents you’ll need.

  1. Navigate to Settings.
  2. Click SMS > Sender information.
  3. Click Port existing number.
  4. Select Short code.
  5. Under Country, select US, CA, UK, or NZ for your short code. For example, select US for a US short code.
  6. Click Continue to open the short-code application form in a new tab.
  7. Complete and submit the application for the short code you want to port.

Port a long code

For help porting a long code in the UK, Ireland, or Australia, contact Klaviyo Support. The Port existing number dialog only offers toll-free numbers and short codes.

Outcome

After you submit your port request, you can expect to be contacted by a Klaviyo representative. After someone reaches out and you submit all required information, the porting process begins:

  • For long codes, porting can take 2 to 4 weeks to complete.
  • For toll-free numbers, porting can take 2 to 4 weeks to complete. You can keep using your existing number with your current provider until the transfer takes place.
  • For short codes, allow 8–12 weeks for porting. Carrier review requirements vary by country.

Additional resources

Find out how to add and remove SMS transactional or marketing consent in Klaviyo. Importing your SMS subscribers is an essential part of migrating providers or simply consolidating your data. - How to create an SMS welcome flow

Learn how to create a welcome flow for your SMS subscribers. - Understanding SMS sending numbers

Learn about the SMS sending numbers for every country that Klaviyo can send to, including what each number type can do.

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