Camera or a smartphone?
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BUT, you probably could use the device with skype using a bluetooth headset. I don't know if it has a 3.5mm stereo+mic headset jack or not.
This is clearly another step is the convergence of phones and pocket cameras. In a few years we'll see devices that aren't as polarized as this, and a few years more, we'll wonder how we didn't consider the integrated devices as the norm.
To sum it up, the Galaxy Camera has microphones and a speaker so you can use it to take phone calls (through Skype), but only in loudspeaker form, as it doesn't have an earpiece. You can connect a headset.
Because the Galaxy Cam lacks 2G support, it will only work when you're either connected to a WiFi connection or if you're in range of a decent 3G signal. That may not be such a huge setback, as VoIP wouldn't work well on 2G anyway.
It is also a lot thicker and heavier than your average mobile phone, so it is not nearly as convenient as carrying a smartphone, even the large ones, like the Samsung Galaxy Note II or the bulky (by today's standards, at least) Nokia Lumia 920.