Not exactly. It's definitely not ADHD if there's no prolonged and debilitating impact. Being distracted an hour there and a couple there is not like ADHD.

ADHD would be like more like falling in a pit where one basically cannot do anything meaningful for days and days despite willing to do so (if the motivation is lost, in turn, we are talking about depression-like states).

I doubt that many of normal smartphone users get into such pits despite they appear distracted and might have an urge to get into one's smartphone.