Android deploy on Sony Xperia S

Ok so I got this Sony Xperia S to develop a game with Unity but I can’t get unity to find the device. Everytime I try to “build & run” he says that there are no devices connected. Windows find the device and it works ok… Am I missing something?

Thanks for the help :confused:

Ok so after trying every suggestion I went on to the window solution. I uninstalled the driver for my phone and pluged him again and BAM it worked. Many thanks all.