If a user plugs in a USB device such as a keyboard or a XInput (AKA XBOX One or XBOX 360) controller, they will be recognized by the game just fine even on the mobile version. The way I was able to plug in a USB device to my phone was because my Galaxy S7 came with a handy-dandy USB to mini-usb adapter so I could plug in any normal USB device. However, if any USB devices are plugged in to the game after it has launched, or are unplugged before the game has been closed it will cause the game to crash.

Device: Samsung Galaxy S7 (SM-G930A)