* GitHub does render .org files just like Markdown!
* I've heard people of people being really happy with Orgzly on Android.
I personally run Emacs on my Android phone through Termux. It works really well for me.
Other solutions include using a SSH client to connect to a server running Emacs, or simply using GitHub directly on mobile web or their app if your notes are on GitHub.
* I've made the switch from Vim to Emacs (+ evil-mode) because of org-mode and have been extremely happy with it. It truly changed my life.
It actually has a positive impact on the Internet speed! Your DNS results are cached locally so the latency is very low, plus blocking ads at the DNS level means you're not even downloading the ad creatives, resulting in a higher speed as well.