Interesting, even though I've never even used a smartphone, much less owned one, and I don't really use DCS. OK, I have a little Remote Commander, but haven't used it in 2 years or so. It's a bit fussy.
I'm one of those CAB-1 with an antenna stuck at about 3" kind of guys.
Since the system uses a phone, can your locomotives call you in the middle of the night?
Enjoyed it, though. But, when you are this far behind, and happy, there's no catching up.