The Sony Ericsson K750, introduced in June 2005, is a high-end mobile phone, the successor to the now discontinued K700, and which was succeeded by the K800i in Q2 2006.

There is one side key on the left of the phone; when pressed in standby mode, it opens either the RDS FM radio or the Media Player as selected by the user, allowing playback of WAV/MP3/AAC audio files, and 3GP/MPEG-4 video files.

On the right-hand side of the phone there are three keys - two for controlling volume, skipping through tracks in the Media Player and zooming in and out when in camera mode.

Since K750i and W800i have essentially the same hardware specifications, soft modifications are available to convert a K750i to a W800i by using flashing software and W800i firmware.

A flashed K750i can also use the flight mode option, allowing the phone to work only as a media player while other functions are restricted.

The Activity Menu will not be present when in flight mode - instead the Walkman player appears when it is pressed.