Emacs is very awkward to use in a mobile phone sadly.
It's not as seamless as I would like, but I manage pretty well with Emacs in Termux and files synced via Syncthing.
Orgzly https://orgzly.com/
a nice way to do org mode editing on the go. Gives you notifications for reminders/deadlines and you can press on tick boxes to toggle them etc. I use it with syncthing.
Typing anything of length and substance on mobile is very awkward, to be fair.
Now, with the voice to speech button, it’s quite easy to get length. Substance is still tricky though.