Read, update, and delete SMS number-resource assets through the Digital Asset API (channel=sms, channelId=1), and manage the SMS-specific opt-out keyword, branded-text RCS app lookup, and DLT entity list endpoints. Unlike the other Digital-Assets channels in this product group, SMS numbers are provisioned through a separate number-management flow, so the shared create operation (POST /v2/digital/app) does not support channel=sms; it remains available only for email, app, rcs, fb, and wa. The id path parameter on the get, update, and delete operations is the number resource id, not an asset/app id. Credential-bearing examples are sanitized for developer-portal publication.