I have tried to run micro https://micro-editor.github.io/ on my phone but this is some other beast if someone is running tmux and vim on their phone
I have found that typing normally is really preferably on android and usually I didn't like having to press columns or ctrl or anything so as such since micro is really just such a great thing overall, it fit so perfectly that when I had that device, I was coding more basic python on my phone than I was on my pc
Although back then I was running alpine on UserLand and I learnt a lot trying to make that alpine vm of sorts to work with python as it basically refused to and I think I learnt a lot which I might have forgotten now but the solution was very hacky (maybe gcompat) and I liked it
I do a lot of development and sysadmin stuff on phones and tablets, to a large degree due to PentiKeyboard. It helps a lot to see the entire screen and have all the usual keyboard sends that a regular, physical keyboard has.
I'm using micro in termux on my android. The keyboard of termux is quite adapted to the CLU bindings (ctrl-f, ctrl-s,...). My main use is to take notes, though I bought a physical small bluetooth keyboard perfect for making a little bit of python scripts from time to time.
I must admit that coding in vim on a kinda big project on a smartphone is really impressive.