Hey @csautot, I hope that you are well! 
Thanks for reaching out to the HubSpot Community!
At the moment, there is no native built-in Meetings toggle for native SMS reminders. However, as a workaround, you could use a workflow for SMS reminders.
I let you explore these options here:
And you can find third-party options on this topic if that’s something you would consider: Text reminder of meeting .
We do track requests in the Ideas forum 
There’s already an idea posted for SMS meeting reminders " Send SMS meeting reminders ", so the best way to support it is by adding your upvote or comment to that existing thread. This helps keep all the feedback in one place and shows how much interest there is in this feature!
Hey @HubDoPete, do you happen to know of another third-party integration to share, please? Or can you think of another workaround to help @csautot, please?
Thanks so much and have a lovely day! 
Bérangère