The left side of cell phone

Where is the left side of cell phone?
Most of asked people responded : "the side where "left" for me is a left side of cell phone." But when I turned phone around, its "left" side became a "right" side for observers.

For me, as humans have "left hand", and it will stay left independently of point of observation, so cell phone has a "left side" independently of point of observation. The "left" side is the property of the system.

So, if we're talking about any object by itself (observer and object don't interact), an observer's imaginary point need to be placed inside of the object.