> I think something like this would be really useful. I've seen services that provide this via a 3rd party hosted service but I don't trust someone at some rand

> I think something like this would be really useful. I've seen services that provide this via a 3rd party hosted service but I don't trust someone at some random company not to read my messages. ... do you know how SMS works? Specifically that it is sent in plaintext for anyone who cares to listen anywhere along the path? Maybe try Signal. It has a desktop app.