Given that so many mobiles now offer pretty much exactly the same grab-bag of features -- music playback, Bluetooth connectivity, decent-but-not-spectacular cameras and so on -- the more pressing differentiator between one model or another has to come from the design of the phone itself. After all, it's not as though you can show your mates the nifty Bluetooth chip within your phone, now can you? That kind of thinking was clearly in the minds of the D900's designers, who have pushed what they claim is the world's slimmest slider phone -- it measures in at 103mm by 51mm by 12.9mm and weighs 85 grams -- onto the local market. For a phone with such a strong design focus, it's interesting to note that the D900 fits in Samsung's business range. Naturally, there's nothing that says that a business phone can't be sexy -- and indeed, if you can convince the boss to stump up for a phone that looks this good, then you can give yourself a hearty pat on the back.
The D900 superficially resembles a number of other Samsung phones in terms of overall design -- it's rather like the supermodel-thin version of the 3G, or Z600, in fact. It's a slider phone with a four-way selector, call and option buttons built into the top part of the slider, while standard dialling keys sit beneath the sliding portion of the phone. The 240 x 320 pixel 2.12-inch display is clear and very bright, although like most slider phones it blanks out when not in use to preserve battery life.
The D900 is a Quad-Band (850/900/1800/1900) GSM phone, so you should be able to use it just about anywhere that a GSM signal propagates on the planet. The integrated mobile camera is an autofocus 3-megapixel model with 4x digital zoom. It's true of all digital zooms, but even more so with mobile cameras -- if you want a bigger shot, you're much better off moving closer to your target in the first place. On the connectivity front, the D900 supports Bluetooth, USB 1.1 connections and PictBridge. Music is supported via MP3, AAC, AAC+, and e-AAC+ audio. There's also the usual raft of SMS/MMS and Java support that you'd expect out of a phone in this price bracket.
Samsung rates the D900 as having a talk time of three hours and a standby time of 250 hours. In our tests we tended to need to recharge every three to four days on a moderate usage pattern, which is about average for a phone these days; neither good nor bad.