check
http://www.gsmhacking.com/cables/ericsson/index.htm T28 schematic by Misiek. It works. If you'll like to unlock your phone, you must use test pinout connected to +5V. Check at least pinouts according to schematic.
Pins used by unlocking cable:
Pin9 - Test& Flash (+5V)
Pin11 - +5V
Pin6 - Rx
Pin7 - Tx
Pin8 - GND
<IMG SRC="http://www.gsmhacking.com/cables/ericsson/t28-pin.gif">
Good look,
GSMdEvil