To send invoices through Short Message Service (SMS), Fiat Lux - ASIA is correct, you'll want to look into our available apps in the QuickBooks App Store and see if there's one that will help you accomplish this.
I can certainly understand how an ability to send invoices via SMS could be useful and have submitted a suggestion about it as of today.
You can also submit your own feature requests while signed in.
Use the Gear (⚙️) icon.
Under Profile, go to Feedback.
Enter your suggestion(s) in the Have feedback? window.
If necessary, attach a file with your Camera (📸) icon.
Your feedback's definitely valuable to Intuit. It will be reviewed by our Product Development team and considered in future updates. You can stay up-to-date with the latest news about your product by checking out Intuit's Product Updates webpage.
Please don't hesitate to send a reply if there's any questions. Have a great day!