SMS campaigns are switched on per workspace by an organisation owner under Organization → Workspaces. Messages send through the SMS provider connected under Integrations.

Where things are
| Page | Use it for |
|---|---|
| SMS → Conversations | Two-way threads with contacts. |
| SMS → Logs | Every message sent and received with its status. |
| SMS → Templates | Reusable messages with variables. |
| SMS → Settings | Sending number and SMS preferences. |
SMS campaigns
Campaigns → New campaign offers Call or SMS. The SMS wizard takes a CSV, a template, the sending number, a start time and a sending rate in messages per minute.
Replies
Replies land in Conversations. An automation with an Inbound Message trigger can answer them automatically; see Automations.
SMS is also in the API: Send SMS, List opt-outs and Create SMS campaign.