Google is your friend?
Do you know if the K200i even has a serial connection?
After a quick google search I found this:
http://bestcelldist.com/sony_ericsson_k200i_serial_data_cable.html
Within 2 minutes I've found numerous websites with the information required on the pinout of the Sony Ericsson 12 pin connector. Not googling before asking here is just plain lazy.