In theory everything should be fine...
Until today I really thought that PDA mode in 12.7 is bounded solution for tablets and shouldn't work with phones, because when I tried to reach SDM site using Android phone with Google Chrome I got on desktop version (force desktop version setting were off), I asked collegue to do the same on his iphone and result was the same.
But today I have tried to check the web-site using Chrome's compatability mode and was a bit confused when I found myself on mobile site...
To present desktop browser as mobile, you need to hit F12, then switch mode (1) and select device (2):
Thanks Carol for your suggestion, but I think that our customers won't use this workaround due to their lazyness...
PS: How it looks on mobile:
Best regards,
cdtj