Hi @hkoops
Unfortunately I can’t get HubSpot SMS because I live in the Third World (outside of the US) so I haven’t played with HubSpot’s SMS yet (I did code my own version to wrok in New Zealand).
Here’s how @karstenkoehler explains how to format phone numbers with a Workflow… you will need to tweak the formula to get the exact format you want. Also, I recommend you add a step in the Workflow to notify the Contact Owner if the Workflow cannot format the phone number correctly.
My assumption (without testing) is the SMS will send if the subscription is unknown or set to consent. The Workflow should show an error if the SMS isn’t sent, but it’s worth doing a test.
Have fun
Mike