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One of the downsides of this mobile is that there's no way of expanding on the built in memory. OK, you get 1GB built in, but really, in these days of 8GB microSD cards, the lack of support feels like a serious omission.
This is also a shame since battery life for music playback was quite good. Nokia suggests you'll get up to nine hours of music playback. I copied a few tracks onto the internal memory via Bluetooth then set the phone to play non-stop, which it happily, and very loudly, did for eight and a half hours. Not quite nine hours, then, but pretty good just the same.
The built in camera shoots stills at a maximum resolution of just 2-megapixels and it has a flash but not much else by way of fancy features. On test performance was quite mixed. Indoors it struggled a little, but sometimes delivered quite well. The coloured dish, photographed under normal household lighting shows good colour accuracy, as do the pink flowers shot outside, though their detailing is flaky.
The chair suffers from a lack of uniformity in its white tones, but definition is reasonable for a 2-megapixel lens. The Sempervivum was a real test. The phone lacks a macro mode and this shot was taken very close in. The flower stem is just a few cm tall. Focus is not uniform but the shot is passable if all you want to do is show it to your mates then delete it.
With a fairly standard S40 software array the Nokia 7900 Crystal Prism has to be all about look and feel. It doesn't do a lot for me on that front. A bundled bandana, even one produced by a well known designer, is too far away from what a mobile phone is all about to draw me in. The camera does quite well, though, and the battery life impresses.