Pay attention, Double-O agents, this technology may look innocent, but there are enough secrets under the hood to defeat the world's most inventive evil geniuses, and their pussycats.

First of all, there's Sony Ericsson's K800i Cybershot™ mobile phone. Slim enough to fit in your pocket or handbag, sleek enough to turn heads when you take it out, the K800i is the undercover operative's friend.

It's a 3G phone, so you can download files quickly, whether that's MI6 profiles, video or music files (it's a music player, too). But don't blow your whole budget on ringtones or games; the Ministry of Defence isn't made of money.

The camera is among the highest-resolution on a communications device: 3.2 megapixels - that's 3.2 million of the tiny dots that make up the picture - enough to record the detail you need to recognise your surveillance target at 50 paces. It has a built-in Xenon flash unit which means, if you weren't paying attention in assimilation seminars, that it's very bright. You can dazzle assailants with this, or at least take their picture in a low-light situation, like a shaken not-stirred cocktail bar. You can upload these images instantly to a blog site.

Better still, the camera has BestPic™ technology which increases your chances of taking the perfect picture nine-fold: by secretly recording in the background, it captures nine images in quick succession, one when you press the camera button, four straight after, plus (and this is the ingenious bit) four before you fully press the button. Check the results and pick the one that's best (see our Broader Picture to see how great this invention is). Unlike most camera phones, it has auto focus, and a sturdy lens-protector. There's even an image stabiliser so you can take a good shot when you're trembling with fear, sorry, that would be adrenalin, wouldn't it?

Moving on, the other communications essential for fieldwork is the Sony Ericsson M600i. This is a smartphone, but it's very slim and, you'll be pleased to hear, exceptionally simple to use. Email is delivered securely to you and its particularly big screen is good for surfing the internet on the move. It's 3G, of course, so again fast data-transfer is the norm. The shortwave radio system, Bluetooth™, will enable you to send files to other phones, and again, no passing Crazy Frog ringtones to the other side.

The screen is touch-sensitive, so you can zoom through menus or enter text with the supplied stylus, thanks to excellent handwriting recognition, though the keys double as a Qwerty keypad, so data entry is easy.

Of course, you can't always be working; EU rules have put an end to those days, sadly. So you can use this phone to relax as well. If you need travel, translation or navigation tools, these are easily downloaded from online shops, so you can work, or play wherever you are. Just go to www.sonyericsson.com/applicationshop and remember you can't claim games as MoD expenses. There's 60MB of memory on board for music tracks, if you must, and this is expandable with Memory Stick add-ons.

There's a flight mode so you can keep working on board an aeroplane, assuming you're on a civilian flight, of course. Along with all your MI6 files, the M600i will work as a calculator, calendar, contacts manager, voice recorder, stop watch and timer. Apparently you can make phone calls on it, as well. Click here for your opportunity to win a Sony Ericsson K800i.

Sony Ericsson M600i, from free, with contract, Sony Ericsson K800i, from free, with contract, Sony Ericsson (08705 237 237; www.sonyericsson.co.uk)