The specification of the K618i already – it’s a very lightweight 3G phone weighing just 89 grams with a 2 megapixel camera, expandable memory (using Memory Stick Micro cards) with a 256Mb card included, it has Bluetooth and of course an MP3 player.

The K618i’s display is only a 176×220 pixel unit, but this is an acceptable trade-off for the handset’s light weight and it will be good enough for most people. Overall, the K618i shows typically stylish Sony Ericsson design – it’s a smart looking device that is pretty unmistakable in its origins.

Sony Ericsson K610i is probably the lightest 3G phone to date, weighing just 92 grams – and yet it still packs in a substantial number of features.

The K610i comes with a 2 megapixel digital camera, 176×220 pixel display in 262,000 colours, a secondary camera for video calling, expandable memory using Sony Memory Stick Micro cards, a multimedia player (plus the same Disc2Phone software found in the Walkman series of handsets), web browser, email client and all the usual features you’d expect to find in this type of device.

The Vodafone 710 is an astonishingly dull 3G phone. As the name suggest, this is strictly a Vodafone-only affair, and other carriers won’t exactly have any sleepless nights over this particular phone.

There is something slightly interesting about the Vodafone 710 which is that it’s made by Huawei Mobile of China, and it’s the first time we’ve seen a Huawei handset launched as a mainstream European phone.

The Sony Ericsson M600i is a 3G phone with tri-band GSM (900/1800/1900), expandable memory (using Memory Stick Micro cards), plus a full range of applications including the Opera web browser, an email client, and multimedia player. Plus the M600i comes with a jog-dial control in addition to the touchscreen, as does the larger P900 series.

This unassuming looking handset is, in fact, the smallest and lightest 3G phone that we’ve ever seen. Weighing just 85 grams, the SGH-Z330 comes with a 1.3 megapixel camera, a secondary camera for video calling, 1.9″ 176×220 pixel display, 140Mb of embedded non-expandable memory, Bluetooth, an MP3/multimedia player, email client and web browser. Although some features have been sacrificed to make the SGH-Z330 a lightweight device, it’s still an impressive little handset, with a decent enough camera and plenty of memory to be useful.

Positioned one notch above the lightweight Z500 3G phone in Samsung’s range, the SGH-Z520 has a 240×320 pixel display main, 2 megapixel primary camera, 40Mb of internal memory with microSD expansion, and MP3/multimedia player, inbuilt “digital power amp” and Bluetooth. There are external media controls too, so the Z520 can be used as an MP3 player when closed.

This swivelling clamshell comes with a 3.2 megapixel camera, a 2.2″ 240×320 pixel display, Bluetooth, 128Mb of internal memory with microSD expansion, an MP3/multimedia player, FM radio and TV output. Being a “Z series” handset, this is also a 3G phone.

There are a few camera phones around like this – designed to look as much like a dedicated camera as well as a phone, and the Z710 certainly looks the part, although there’s no optical zoom on this device. Physically, the SGH-Z710 measures 96×48x20mm and weighs 107 grams.