An older man with curly white hair sits on a red bench, intently looking at a screen.
A man is playing a mobile game on his mobile device in the park.
The screen the man is looking at could be on any type of device, there is no way to imply that it is on a mobile device.  The man could be sitting anywhere, there is no indication that he is in the park.  The fact that the man is intently looking at a screen does not imply that he is playing a mobile game.  He could be looking at the screen for any reason.
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