when a Smartphone has a screen size of 15.6 inches, and with that 15.6 inches form  factor ,  a   15.6 inches  Smartphone  can be a good gaming phone or a  good gaming  Tablet   too .  It is just like  having  a  Windows    gaming  laptop with a screen size of   15.6 inches   

The picture above is for illustrative purposes only , it is not the actual picture , it is not the exact picture of  a   15.6 inches   Smartphone .