I have Flow sending internal emails but sending SMS would be even better for my staff who rarely check their emails.
Not natively , there a couple flow-integrations that can.
With the flow http-send-request action you could call a webhook or connect to an api that provides sms messaging, such as the twilio service.
Some lowcode/nocode services that a store may already be using like ifttt, zapier have sms features as well
https://zapier.com/apps/sms/integrations
A bit more advanced usemechanic app, integrates with flow, has an example of sending an sms via nexmo(vonage) and working with flow
https://tasks.mechanic.dev/send-an-sms-via-nexmo-when-a-product-is-created
The shortest path to using SMS with Flow would be to choose one of the existing 3p actions. As @PaulNewton said, you could also use Send HTTP Request with your service of choice (e.g., like Twilio). Flow will likely not support a native SMS action due to the difficulty in policing bad actors.
Thanks Paul & Paul. I tried with Twilio and got a bit lost but I was able to make it work with Zapier. I’m happy with that!