From e2save website:
"T-mobile EXCLUSIVE version of the Sony Ericsson K750i - LIMITED STOCK
The Sony Ericsson D750i mobile phone is a stylish device that offers lots of great features. The D750is clean design integrates a 2.0 megapixel camera and a 262K TFT colour display. Once taken, images or video can be edited using the Sony Ericsson D750is Video DJ software and sent via Quickshare to Bluetooth or multimedia messaging service (MMS) compatible devices.
The Sony Ericsson D750i also features a multimedia player with Mega Bass, an RDS Radio and the brilliant 3D racing game Motoraver."
The D750i is no longer on the T-Mobile website, so there probably aren't many of these around anymore. Seems like a good deal for the new 12 month Flext 25 contracts.