[qnsi]

I think everyone here has a living experience of how smartphones reduce productivity. Even seeing one makes me want to check if I have new messages for example. Even if this one test did not replicate, I think its fair to say that there is a dark side of smartphone use

[Zababa]

That's the case if you often get messages or notifications. I often get less than one message a day on my smartphone, so I can keep it on my desk without problems.