Update from Atlassian team:
Hey folks!

Thank you for being so patient on this one. Now that we've released Incident Responders as a feature in Jira Service Management Cloud, you can set up alert notification preferences for the responders added to incident issues in Jira Service Management, including the ability to notify via SMS.

You can find the feature announcement here: https://community.atlassian.com/t5/Jira-Service-Management-articles/Announcing-Incident-Responders-and-Linked-Alerts-in-Jira-Service/ba-p/1782632

Here's how to add the field: https://support.atlassian.com/jira-service-management-cloud/docs/add-or-remove-the-responders-panel-from-your-service-project/

Marking this one as resolved, but for other issues more generally beyond incidents, you can follow this ticket here: https://jira.atlassian.com/browse/JSDCLOUD-8607

Let me know if you have any questions in the comments!

Cheers,
Daniel Brockwell (Product Manager for JSM Incident Management)

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Hi,

Our service desk have a requirement as follows:

A messaging facility to send messages via SMS text so that on-call engineers or senior managers can be alerted out of hours when there is a major incident.

This is a nice to have feature rather than must have for us.

Regards,
Adam