Hi @MarissaC12, welcome to the community.

As far as I know, at the moment you can only include the Virtual Contact Card within a Flow Message.  What I recommend you do is to create a Segment Triggered Flow that then sends those folks an email.  Here are the steps:

• Create a Segment (or List) of subscribers who subscribed to the old phone number. 
• Create a “Segment Triggered Flow” and select the Segment you made.
• In the Flow, add an initial time delay, then a single SMS message with the Virtual Contact Card.
• Back Populate the Flow and it should start sending folks with the new Contact Card.

Here’s more information about adding a Virtual Contact Card within a Flow Message:

• How to add a virtual contact card to a flow message

Hope this helps!

It now will not let you use back populate when a contact card is in the flow. 

Hey @braidbabes,

Thanks for calling this out! You’re absolutely correct that you cannot back-populate a flow that contains a virtual contact card. This is also called out in our How to add a virtual contact card to a flow message Help Center article.

In my opinion, using a custom keyword triggered flow for something like this is more sustainable. For example, if a virtual contact card was included only in a welcome series flow, this means users would only receive that option to save the contact once. Whereas, with a custom keyword triggered flow, since it’s a metric triggered flow, whenever someone sends this custom keyword, they will be sent the option to store the contact. 

Not only would this be a great use case for when users switch forms. But also for users who may not want to store the number at the time, but can always send a specific text to save the number at a later time. I.E. a first time customer who may not have much brand loyalty would ignore the virtual contact card in a welcome series flow but when they later become a loyal customer who do want to save the contact. 

I would recommend taking a look at our How to create flows to respond to sent SMS messages Help Center article to learn how to set this sort of flow up. 

David