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One of these bad boys ?

Bear in mind the pstn shut off will have unknown issues with comms. I wouldnt be using pstn for any primary path. However the question is very open, I like HKC for rf, 6wb like texecom, gg likes honeywell etc

I would agree with this. If you don't keep your phone up to date, or buy the latest model and the app isn't kept up to date, then the chances of issues are high. If you have a look at a few apps reviews, you'll soon see posts of unhappy users where phones and OS versions no longer work. As a an app developer myself, I am often forced to update the app in order to keep provisioning on the stores. Some of these forced updates end up dropping support for older devices, leaving users with very old devices none too pleased.

with lots of support calls, very little income

But it doesn't work well....

The Honeywell Galaxy Flex gives all this. Honeywell provide the flash upgrade program and firmware on their website without any login account requirement too. The app and push notification is free and there are low cost alternatives in the event that Honeywell do start charging. Look out for other offerings that integrate cloud services tightly with the panel, as they may not charge at the moment, but you could find yourself held over a barrel in the future.

Pyronix? Yale? Who else is free app?