Requriments:
1-development board
2-Android phone
3-Usb cable
Download termux to your phone. Install nmap and ssh to your phone in termux. Boot up your armbian device. Plug your phone. Go settings and turn on usb tethering. Find your armbian device with nmap. Connect it with ssh. Done
If you like you can download x11vnc to armbian device and vnc viewer to your phone and use your phone as a screen and keyboard and mouse. All in one
Thats how i like to control my orange pi one hope you like it