Is the question asking whether you can send SMS without using any cloud API (eg. Twilio, MessageBird), or even without using API from hardware SMS gateways?
I once saw this some time back, but forgot the URL. I had a hard time finding it again 'cos Google keeps showing me articles on HN ranking algorithm. Probably 'cos the site is non-https?
"To his surprise, the app that he used to record his regular rides from Bethesda into Georgetown via the Capital Crescent Trail shared that information publicly, not just with his network of friends and followers. Someone had located a record of his ride on the path on June 2, matched it to the location of the assault from the video, matched his profile picture — white guy, aviator-style sunglasses, helmet obscuring much of his head — to the man in the video, and shared the hunch publicly."
We use this daily in our company. Projects are organized as boards. To solve visibility issues across multiple boards we develop a standalone program to consolidate cards from multiple boards to a user view. There has been issues like CPU usage, UI bugs and build issues but on the whole it is still quite useful.
Development and releases seems haphazard and there are no unit tests. Only eslint.
