I don't think there is a solid point at which we can say "this is a phone and this is not anymore". The world just does not work black and white like that. These devices have evolved to a point that we might start thinking "is this even a phone anymore?" Your question is: what point was that? My answer: I don't know. I don't think the answer to that question is really important and it distracts from my original question: what should we be calling it?
I am tempted to try to answer your question though.
I think that phones became something else at the moment they were better than other (dedicated) devices in what they could do.
Let me explain.
-My phone is a better MP3 played than my iPod classic. Why? Because it can also stream music (Spotify, YouTube, etc), and I always have it with me.
-My phone is a better photocamera than my old Canon. Not only is the picture quality better (it's an old 12MP consumer camera), it also has more storage space and I always have it with me.
-My phone is a better videocamera than anything I've ever owned. I can store all video internally and have it uploaded automatically to my dropbox. Also the picture quality is better, I can do slomo, timelapse etc. Also, I always have it with me.
-My phone is a better messaging device than any alternative, because I can reach more people
all the time, because most people I know carry their phones on them,
all the time.
So my phone replaced my need for any of these other devices. I used to own a video camera, a photo camera, an MP3 player, portable game consoles etc. Now I just have a phone. The moment my need for these other devices dissipated, it became something much more than a phone,
for me. The point in time that this happens is probably different for everyone though.
Writing this I have to conclude that there is one feature that overrules all other features in importance: portability.
If there would be a proper name, it had something to do with the mobility of these things.
Some very bad and obvious ones:
iPortable
iMobile
