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+1 for Termux.

I started using it purely for the novelty of running emacs on my phone (a moto x pure) and it's a great piece of software. It's even open source!

How do you use it? I couldn't imagine using Emacs with a software keyboard.

If using software keyboard, Hacker Keyboard works great!

Otherwise, the Logitech K380 Multi-Device Bluetooth Keyboard ( https://www.amazon.com/dp/B0148NPH9I/ref=cm_sw_r_other_apa_l... ) is great.

Volume up and down are used as modifiers. Sounds crazy but it works.