What kind of phone are you using?

If it's Android you can at least for the moment get Emacs on there using Termux. That's what I do - and it works pretty well. It might also be possible via UserLAnd, although I have not tried UserLAnd personally.

It seems like iSH on iPhone may provide similar ability (again do not have direct experience) although it seems unclear at the moment how long it will be able to remain available.