I don't know what the SMS service part of Pushover uses as we don't send SMS through Pushover. The part we use, the main feature, sends a notification through an app the user installs on their device. All of us who receive push notifications through our system have the Pushover app on our phones, some also have it on their tablets and computers.
I like the Apple Watch integration as I can interact with urgent notifications just on my watch without my phone handy.
Interesting. I had an app, that had pretty much this functionality. Read the SMS from a phone and send a push notification with the content to a second phone. Google killed it though, because they said it does not have a legitimate reason to read SMS. Still a bit bitter about it.
You can rig this up yourself with Tasker and Pushover. There is an plug in for Tasker that enables using REST API calls and with variable names in the call so you can capture the text of an SMS. I used to do this for an old hotline phone.
