"Do I-phones lower IQ?"
The objective answer is "No."
But the subjective reality, viewed in light of the way in which the device is utilized is emphatically "Yes!"
There's a joke that's been going around for a while now. It goes like this:
"I have in my pocket a small device that can access virtually the entire sum of human knowledge from the founding of civilization through the nuclear and space age.
It includes the writings and speculations of every great philosopher and scientist the world has ever known.
I use it to play video games and argue with strangers."
In short, the iPhone is a part of the pop culture that substitutes activity and information for understanding.
“Who would have thought, 30 years ago, that someday you’d carry in your pocket a device that could link you to all of man’s knowledge instantly, and instead, you’d use it to save pictures of cats and to get into arguments with people you don’t know?”