The thing that amazes me is what games support bluetooth joysticks and what what ones don't. I played commander keen on Android, a side scrolling adventure game from the 90s. The developer put the original ROM for the game in a DOS emulator, the emulator works with bluetooth joysticks so I was able to play commander keen on my smart TV box and phone with my bluetooth joystick. But "call of Duty mobile edition" doesn't seem to support bluetooth controllers so I guess they just expect everyone to poke their screen the whole time. It would seem to be the other way around, you would expect "Call of Duty" to be the game that supports Bluetooth controllers but it isn't it is the ported commander keen games that works with it.