Adding SMS
Navigate to Products & Services -> Channels -> SMS.
Click '+Activate channel'.
This adds SMS as a channel on the My Workspace tab.
On the My Workspace tab, click the SMS card to open your SMS channel management page.
From here, you can:
Add new SMS setups
View and manage your SMS setups
View, manage and purchase new long numbers and short codes
Register for and manage US Long Number (10DLC)
View, manage, and add test phones