The ol' phone-in-gun trick, eh?
We can assume this gun-cellphone hybrid is just a nifty edit job and Nokia hasn't lost their minds, nevertheless, it does raise the disturbed question of "why?"

I imagine the mentality went something like 'me likey phones, me likey guns, me put phone in gun'. How would this work, anyway? "Oh hold on a second, honey, I have to kill a man."
Not to mention original.
http://www.geekologie.com/2008/12/_remember_the_cell_phone.php
By the way, the main point of my argument is that if Nokia releases that kind of gun mobile phone, it is highly likely to ban by the various governments sooner rather than later. Of course, there are still some gun-mobile phones but they are illegal and likely to confiscate by police in Australia if you are jogging around with that mobile-guns, Hee Hee......