How to obtain 3-letter 'Sales Code' (PCode)
You can do it either way but first is in my opinion fastest:
2) Use SGS CSC Selector and read the 'Sales Code' (PCode). Do not hit 'Install' as it will wipe Your phone.
3) Dial *#06# to get the IMEI and write it down; Dial *#272*IMEI# on the dial pad.
Check Your 'Sales Code' (PCode) - after that hit 'Cancel' ! / 'Install' will wipe Your phone.