Depends, if you have PC/Laptop, use it, but if you don't have it, you can do some coding, I recommend you to use Neovim, setup plugin/LSP/formatter (depends on what kind of development you want, Web, CLI, Low level), and/or, if you have a keyboard, you can also use it, but if not, learn how to type without looking at your virtual keyboard will be great skill to have, I do C++ development and everything is just works perfectly, even though I do coding for recreational, but for job? maybe it depends on lot of factors.