This unlocked cell phone can be used with a GSM network service provider and it provides tri-band connectivity (900 MHz, 1800 MHz, 1900 MHz) as well as GPRS data connectivity. It does not come with a SIM card, and it requires that you provide a SIM card for usage with your selected service provider.

Phone Features
The candybar-styled W200i offers a numeric keypad, five-way navigation toggle, and send/end as well as two soft keys that sit below the 1.8-inch LCD screen (with a 128 x 160-pixel resolution and 65K color depth). The phone has an internal 27 MB memory, which can be expanded via optional Memory Stick Micro (M2) media. The phone supports multiple numbers per contact entry, picture and ringer ID, and both polyphonic and MP3 ringtones. It also displays the most recent 30 received/dialed/missed calls.

The digital audio player is compatible with MP3 and AAC/AAC+ formats. It's easy to manage the music in your phone--a single click starts the Walkman music player. From there, you can play, rewind, fast forward, equalise, shuffle tracks and create playlists--just like in any other digital music player.

This Walkman phone features MegaBass enhancement for added depth of sound, a flight mode that lets you keep listening to tunes with the phone's network connectivity turned off, and the PlayNow feature that enables you to download new music tones directly to the phone. With Sony Ericsson's Disc2Phone software, you can easily transfer song files between the phone and your PC. It also includes a built-in FM radio with RDS, which displays the name of the currently playing song (when tuned to compatible radio stations).

If you're looking for a mobile productivity partner, the K810i has you covered. Support is built in for sending and receiving pictures, text, graphics, and sound via MMS messages. When used in combination with the phone's built-in still and video camera, MMS opens up a whole new world of messaging possibilities. T9 text entry, a technology that makes it easier for people to enter words and text on handsets, is built into the unit-- a plus for mobile email and text messaging users. The phone also ships with a built-in email client with support for POP3 and IMAP4 protocols.

Other features include: