It used to not work on PC, either. I am not using the plugin anymore, so I don’t know about updates for supporting SSH protocol.
You can take your issue to the Git developer by going to the Github repo of the plugin and file an issue.
- Looks like you’ve already done that.
In the meantime, on Windows, you can use GitHub desktop using this tutorial.
On mobile, it’s trickier and depends on what OS device you have. On iOS, there’s A-Shell, on Android, I don’t know. Possibly you can use Termux terminal as they talk about it here.
There might even be dedicated apps that can do git and are more advanced than MGit, for instance.