If a customer requests to stop receiving marketing SMS messages, you can now unsubscribe them from their customer profile.
Previously, only the customer could manage this by replying “STOP” to one of the marketing messages.
To do this, click Customers > Customer List > search for the customer and click their name.
Below their name you'll find Marketing SMS with an 'x' next to it. Click it to unsubscribe them.
Note that:
This will only unsubscribe them from marketing text messages
You can always resubscribe them later from the same place.