I would like to use emacs and org mode to organise my life. But I think without it being useful on mobile phone, for me is a no go. I will keep using Google calendar for now.
You can install Termux on Android devices and use Emacs there. I use it on more or less read only on the smartphone and actively on a tablet. Both rsync with my desktop from inside Termux.
I was very much in the same boat. I’m on iOS, and found beorg, and it is simply splendid. Very active development, powerful customization available, etc.
yes for iOS, I suggest you take a look at beorg, it is quite nice for quick editing and note taking. Of course the real magic truely happens when org is paired with Emacs but the app is quite useful for basic tasks.
http://www.orgzly.com/