I too still like the DCS remote. Have been thinking about getting another one just in case? However, if you don't have a smart phone and might be thinking about one (or two)...
FWIW, T-Mobile has a deal for those of us over 55. Two phones, unlimited everything for $60 a month, no added fees or taxes. You have to sign up for auto pay to get the $60 a month, otherwise it's $70 for same deal and you pay monthly as most of us are accustomed to. I put the monthly charge on my Visa, I get cash back and I don't like anyone having access to my bank account.
My wife wanted an iphone and I was talking to the phone guy at Costco. He told me about the T-Mobile deal. Verizon was charging me $47 & change per month for one flip phone, 400 minutes, no data and no text. This was a week or two before the iphone 8 came out and Costco had the iphone 7 for $100 off. After learning all that, I got 2 iphones (the 7) and switched. The guy set me up and changed everything right there in Costso. So far, after about 3 months now, I have been very happy with T-Mobile and the iphones. Still learning to use the iphone, but they are very handy to have and I think I have now been converted. But, I still like the DCS remote to run trains. Switching to the app may be in the cards someday though.
Anyway, just something I ran across a few months ago and thought I would pass it on in case anyone was interested. It is really a pretty good deal. T-Mobile's coverage in the West and Rocky Mountain areas hasn't quite caught up to Verizon, but it's getting there. They cover the East and Midwest pretty well. So be sure to check the coverage in your area...'can you hear me now' type of thing.
I am in no way connected with Costco or T-Mobile either, just thought this was a good deal. I am sure you can get the phones anywhere and also the T-mobile service where ever it is offered.
And a oops, I should have also added what Barry posted above, you don't need smart phone service to use the app, just a smart device with wifi to run the app. I got carried away with the T-Mobile deal...