I'm the AC from 12:48, and I stand by my statement.
I wasn't referring to the Galileo experiment, I was referring to the AC at 11:57 who brought up the vacuum experiment, which isn't relevant here because the iPhone was not dropped in a vacuum. I'm not throwing out the theories behind it, just the relevance.
The reason I mentioned reading up on terminal velocity is because, outside of a vacuum, it is relevant - at some point the iPhone will experience enough drag (mg, in fact) through air to prevent any further acceleration, which was the OPs original point.
If you substitute "weight" for "mass" in the OPs message, do you feel happier? I tend to assume people say weight and mean mass, and I don't feel any worse off for it, in the same way that most people use kg instead of kgf (or N).