I have to disagree with some of the trashing being done here about the N73. Yes it's a slow phone, as expected from a smartphone. But that's a price you pay for the functionality that you get. There are countless applications that you can install into your phone which are totally handy. For those who love to play music videos and movies, the built-in Realplayer may only play at 15 fps but it can support h264 encoded mp4 files. That's way better quality video than normal mp4.
For geeks like me who really want to see full motion, high quality video, here's a nice surprise. The N73 has a pretty capable processor, only nokia somehow limited the playback speed of the Realplayer in the N73 to, one can only assume, pave the way for their "video phone" N93. But there's a workaround to that! Lonely Cat Games' SmartMovie Player. With it, you can watch "very" (and I mean it) high quality videos encoded with the best codecs around like, divx, divx5/6 and it's open source counterpart xvid. So you'll be able to watch those pretty fast action scenes in it's entire glory!
As for the music, I have the music edition so no problem there. Some people say the K800i has the better speaker. My boyfriend has the k800i. I've yet to see any real difference. Both have good sound, and both crack when the volume is turned all the way up. But I have to say I love the K800i's music interface more than the N73's which has a lot to be desired. One thing that I find quite nice about the N73 music edition is it's "Loud" option. When you're using the headphone, it makes it sound like the music is coming from everywhere unlike when it's turned off, then you can pretty much feel it coming from just the headphone close to your ear.
So moving on to the camera which is pretty much the rave about these phones. It all comes down to just what you want it for.
If you are a hobbyist photographer who likes to take pictures with your handy phone then N73 is for you. If you're the social person who likes to take pictures of you and your friends, then K800i is for you.
The N73 takes vivid pictures with great contrast. Which is great for macro, landscape and any other shots involving scenery. Flowers will be more vibrant, skies bluer and the grass greener. I've compared more than a hundred scenery shots with my N73 and my boyfriends K800i and the N73's pictures came out with more vibrant colors, more contrast and sharper details like grass stalks.
The bad thing about the N73's image processor is that most of the time, it over-exposes the highlights. So you need to turn down the exposure a ".5 stop" down to get the details back. Something you never need to do with the K800i. Low-light pictures leave much to be desired with the N73. The N73 can only slow down the shutter speed up to half of a second, which means less light captured. What's more interesting is that it compensates for the lack of light by turning the ISO up, which produces a lot of noise. You can turn down the ISO but the picture gets too dark to be usable. The flash is a led bulb and not a real xenon bulb, which brings us to the K800i.
The K800i takes wonderful pictures at night with your friends. The xenon flash can light up to three meters during which the N73 failed miserably. Using the flash as a fill-flash works great on the K800i. Not on the N73. The reason the K800i takes better portrait pictures is that the N73 has a much wider-angle lens than the K800i. The N73 takes fine portraits up-close but stand two-three meters away from the phone and you'll look fatter than usual. This doesn't happen with the K800i. Some purists like the low contrast, natural colors that come out of the K800i. It's their choice.
The K800i suffers from a green tint while the N73 suffers from a blue tint. Nothing a little white-balance adjustment can cure but in some cases, the green tint still lingers with the K800i. I found some scene shots from the K800i unappealing because of this.
As I've said before, it depends on what you wanna do with your camera phone. If you want to shoot places and want great looking scenic pictures, the N73 is for you. If you want great portraits day and night, the K800i is for you. If you want better pictures, go buy a good camera!
And whatever you do always remember: It's the photographer, not the camera.
I'll leave a few pictures here taken with my N73.
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[img width=500 height=375]http://farm2.static.flickr.com/1310/545999453_0d4dde33d1_b.jpg[/img]
[img width=375 height=500]http://farm2.static.flickr.com/1175/557868821_3603586179_o.jpg[/img]
[img width=500 height=375]http://farm2.static.flickr.com/1386/571113004_54d86067b8_o.jpg[/img]
[img width=500 height=375]http://farm2.static.flickr.com/1077/591935222_32a62542b7_o.jpg[/img]
[img width=500 height=375]http://farm2.static.flickr.com/1124/706436188_6e164ad1a9_o.jpg[/img]
[img width=500 height=375]http://img50.imageshack.us/img50/8107/050720072941dx7.jpg[/img]