There's no ambiguity with the latest addition to O2's Xda smart phone range. No attempt to gild its utilitarian lily with sparkly fun accoutrements beyond what decency demands.

It's a slick black brick of a work phone that focuses firmly on the business side of life with Windows Mobile 6 and all its related apps, HSDPA, Wi-Fi, push email and slide-out QWERTY keyboard.

Like the other phones in the Xda range, the Atmos is actually made by Taiwan's HTC, which provides similar Windows Mobile smart phones for Orange and T-Mobile and is also doing very well under its own name with its clever Touch series. In fact the Atmos has another life as the SIM-free HTC S730 though you may have trouble tracking one down in the UK.

Don't touch!

There's no touchscreen with the Atmos, which uses Windows Mobile 6 Standard (the non-touch screen version of the occasionally quirky Windows OS) and relies on more conventional soft keys and D-pad for navigation, which was initially slightly confusing for our touchscreen savvy fingers.

The casing is uniform matt black and extremely serious and business-looking, clad in a rubberised black plastic that manages the trick of allowing it to slide into the pocket without much resistance, but will cling to desktops without unnecessary sliding.

Part of the reason for that desktop cling however could be due to the weight. It's a 150g brick of a handset that is only slightly offset by its compact dimensions.

The large 2.4in screen has just 65,000 colours, which rather underlines the handset's all work no play approach. It's perfectly fine for viewing documents and emails but you may hanker after the finer detail offered by some other phones.

Take the shortcut

The screen defaults to the usual Windows Mobile 6 home screen, which is again plain but functional with up to ten shortcut icons across the top for accessing your most-used apps, as well as showing date, time, calendar entries and messages.

The screen's size seems to squash the numerical keypad into the bottom third of the handset, but thankfully the buttons are well spaced and easy to use. On the side is a dedicated comms manager button, which allows you to access your Wi-Fi and Bluetooth links, establish Microsoft's Direct Push email and launch airplane mode. It's a useful tool on a device like this, which also boasts 3.6Mbps HSDPA fast 3G connection among its connection options.

The QWERTY keyboard slides out to the right and is as good an example of such a thing as you'll find anywhere. The slide feels sturdy and secure, and the screen automatically flips to landscape mode when the keyboard is in use.

The keys themselves are tiny, but a little clever design renders them perfectly useable by having a slightly raised central pad within each, which goes a long way towards helping your thumbs find the right keys.

Keys double up

There are only three lines of keys, with the numbers doubled up on the letter keys. These and additional characters are accessed by Fn and Shift keys (with little LEDs which light up to show you which of these is in use). There are also a couple of additional short cut keys for accessing keyboard-friendly functions like email and Internet Explorer.

For web browsing, it only comes with Internet Explorer, unlike HTC-branded devices which also bundle the faster Opera browser, though you can always download this for yourself. This version of the Explorer browser feels decidedly clunky these days.