Unfortunately the app is a mobile web app that will only work on a smartphone.

Instagram is also a phone only app, so users without smartphones are not able to use Instagram

Thanks for the different perspective.

It's not that we want to peeve off anybody.

Would you be alright going to m.domain.com on your PC only to be redirected to domain.com? Would you still want to try getting into m.domain.com on your PC?

There's no difference with using domain.com for mobile web app only. It's just the URL address being used is different (domain.com vs m.domain.com). Let me know your thoughts.

Noted and thanks for the feedback. www.domain.com/welcome is definitely better.

My main concern is whether there is any issues using www.domain.com for the mobile site (and not m., or .mobi, or .com/directory). Any thoughts on this?

I can't speak for any issues (are you thinking in terms of SEO?) except for the fact that it would be better if you drop the "www." in your marketing as well. It distracts.

Yes, can drop www ie. straight to domain.com on a mobile device to access the mobile web app. Just that I can't seem to find any mobile web app or site that uses domain.com as it's homepage. Its normally a m., .mobi, or .com/sub-directory.

So wondering whether I am missing something if I don't follow the norms and just use domain.com for my mobile site exclusively.

Thanks for the feedback logn. I appreciate it. It's a good point that I did not consider.