Samsung S5 mini supports Gamepad through OTG?

I saw a video and some discussion where people just plug and play gamepads on to Android phones. I've got a Samsung S5 mini (SM G800F, Android 4.4.2, not rooted). Bought a wire USB SNES Clone + OTG from ebay, plugged to my phone but nothing happened: tested on games, an app to debug gamepads, with a different and new USB Gamepad etc; I thought the USB OTG was damaged, because I tested with two different usb gamepads, so I bought a new setup ( http://www.ebay.co.uk/itm/301836055385 ) + a different OTG cable from a different manufacturer. It doesn't work! Used this app to check for OTG support: https://play.google.com/store/apps/details?id=com.btssm.doihaveotg It's supported but no devices are listed / none found; Devices tested: http://www.ebay.co.uk/itm/USB-OTG-Android-Phone-Mobile-Retro-Gaming-Controller-Gamepad-Snes-Style-Pad-/291568165867?hash=item43e2d123eb:g:K10AAOSwVL1V~Rtn http://www.ebay.co.uk/itm/301836055385 http://www.ebay.co.uk/itm/331719411548 http://www.ebay.co.uk/itm/151860529835 http://www.ebay.co.uk/itm/262031124734