Image sharing is the best asset of the Sony Ericsson K205i Mobile Phone. Photos taken on its camera can easily be sent to other devices as a picture message with a single button click. The device weighs only 82g and measures 103 by 46 by 17mm. It has 65K colour STN screen with 128 by 128 pixel resolution. The Sony Ericsson K205i Mobile Phone operates on Tri-Band GSM networks and can connect to the Internet via WAP. The unit has an elegant black with white colour coating on its face and accents sophistication of the device.

The Sony Ericsson K205i Mobile Phone has an Infrared port used to transfer data to other devices with similar technologies. It can send simple text messages via SMS or messages embedded with pictures via MMS. Both formats can use the predictive text input function of the device to easily enter a word which is most probably the one to be typed by the user. The Sony Ericsson K205i Mobile Phone has polyphonic ringtones and a vibrating alert function. Speakerphone capability can also be activated.

An easy-to-use keypad can be seen on the front face of the Sony Ericsson K205i Mobile Phone. It also has a navigation key for faster movement within the menu function. Customising the unit can be done by changing its picture wallpaper. The phone also has various personal management tools including an alarm clock, a calculator, a calendar, a phone book, a stopwatch, and a timer. The unit is compatible with Sony Ericsson Ericsson accessories such as the car holder, the stereo portable handsfree headset and the desk stand charger.