You can use your mobile phone as a hotspot and stream to a RTMP server like Facebook or YouTube with the plug-in below:
http://theta360.guide/plugin-user-guide/wireless-stream/
You can get the 4K stream onto something like Oculus Go with webRTC.
I do not know of any public application that allows a USB cable to stream to an Android device.
I know people have successfully done this for their own work projects (source code not released).