A compact classic

Slim, elegant, with a back-lit keypad and large screen; you can access the most used functions in one or two steps and talk and surf at the same time.
Big on business
Push email and PC synchronisation ensure you’re always on top of things; and it’s a high-speed modem to connect your PC to the Internet on the go.
Enjoy the small world
News and events are at your fingertips with RSS feeds, and you’ve got music, video and games to entertain you in flight or when you deserve a break.
Description
The K610i is a very lightweight and compact 3G phone equipped with video calling, a 2 megapixel camera, stereo music player and a memory card slot for storing plenty of music. It does suffer from a small keypad, no flash on the camera and some models have a tendency to freeze or shut down, so be careful when buying.
The Sony Ericsson K610i is a slimline featherweight 3G phone. Thinner and lighter than either the Motorola V3X or the LG U880, the K610i sets the standards for compactness in the 3G world (the Samsung Z510 is thinner but heavier). Available in red or silver, it's an attractive, conventional-looking phone with a nice keypad (large fingers watch out!) and thankfully a 5-way navigation key instead of Sony's horrible joystick that makes an appearance in some of its phones.
The K610i ticks most boxes, with its stereo MP3 player, 2 megapixel camera, video calling, memory card & Bluetooth. But still, we're left a little unsure what the K610i is for. It's not got the best camera, it's not a Walkman phone, it's not packed with business features - it's just small. Presumably it's targeted at women more than men. So if you're looking for a compact phone filled with features, but not the best in any particular area, the K610i could be your phone. It certainly does most things that most people want from a phone.
There are a few faults with the K610i: as mentioned above the keypad is rather small and fiddly (especially for man-size fingers); there's no flash with the camera, so forget photography at night; and it does seem to have a tendency to shut down or reboot, as reported by several users. The Sony Ericsson V630i is a Vodafone-exclusive version of the K610i with some additional music features such as Vodafone RadioDJ. For a more reliable alternative to the K610i, you might consider the clamshell design Z610i, which is highly rated, or the more upmarket W880i - the ultra-slim 3G Walkman phone.
The Sony Ericsson K610im is exactly the same as the K610i except that it also has i-mode. i-mode is a new and more convenient way to access the internet from a mobile phone. You can use i-mode to browse web sites or to send mail via iMail.